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Conceptual design

Conceptual design is the initial phase of the design process in disciplines such as engineering, architecture, and product development, where high-level ideas, concepts, and preliminary solutions are generated and evaluated to address a defined problem or fulfill mission needs, serving as the foundation for subsequent detailed development.^[1]^[2] This stage emphasizes creativity and exploration, transforming abstract requirements into tangible outlines of form, function, and feasibility while considering constraints like cost, sustainability, and user needs.^[3]^[4] In engineering contexts, conceptual design begins with identifying mission needs and proceeds through formulation of objectives, generation of alternative concepts, analysis of their attributes, and selection of the most viable option using tools such as weighted decision matrices or CAD models to visualize variants.^[5]^[6] The process is iterative and interactive, involving steps like problem definition, idea generation, system architecture establishment, and evaluation to ensure technically sound, affordable alternatives that provide a basis for cost estimation and project merit assessment.^[1]^[3] Outputs typically include concept sketches, whitepapers, or baseline designs that guide the transition to embodiment and detailed phases.^[5] Within architecture, conceptual design establishes the core idea or theme underlying a project's development, focusing on schematic outlines of spatial organization, scale, and operational flow to influence up to 80% of the building's lifecycle costs and performance.^[2]^[7] It often incorporates early prioritization of requirements, exploration of passive strategies for sustainability, and basic modeling to refine functional elements before advancing to technical documentation.^[8]^[9] In product design, this phase centers on creating functions and behaviors that satisfy customer requirements through ideation, such as brainstorming and attribute analysis, resulting in modular concepts that balance innovation with manufacturability.^[4]^[10] It integrates user-centered approaches, prototyping sketches, and validation to converge on promising alternatives, ensuring alignment with broader development goals like assembly efficiency and market viability.^[11]^[12]

Definition and Overview

Definition

Conceptual design is the exploratory stage of the design process where abstract ideas are generated, refined into viable concepts, and initially assessed for feasibility, all without committing to detailed technical specifications or implementations.^[13] This phase focuses on establishing the high-level form, function, and overall structure of a product, system, or solution to align with identified requirements and constraints.^[14] In engineering and product design contexts, it serves as a bridge between problem identification and subsequent detailed development, ensuring that innovative solutions are grounded in practical considerations from the outset.^[15] Key characteristics of conceptual design include a strong emphasis on creativity, iteration, and the broad exploration of multiple possibilities to foster innovation.^[14] It involves iterative cycles of generation and evaluation, encouraging lateral thinking to produce diverse alternatives that address core functions and user needs.^[14] Central to this stage is the translation of client requirements or problem statements into initial visual or descriptive representations, such as sketches, diagrams, or basic models, which help communicate and refine emerging concepts. These elements underscore its role in minimizing risks by shaping approximately 70% of a product's final cost through early decisions.^[14] While ideation centers on producing a wide array of raw ideas through divergent thinking, conceptual design distinguishes itself by structuring and refining those ideas into coherent, evaluable proposals that balance creativity with preliminary feasibility.^[16] For example, in product design, this might involve developing initial wireframes or mood boards to outline user experience flows and aesthetic directions, providing a tangible foundation for further iteration.^[17] This phase aligns closely with the empathize and define stages of design thinking, where understanding user needs informs the framing of design challenges.^[18]

Historical Context

The origins of conceptual design as a formalized practice trace back to the 1960s design methods movement, which sought to apply systematic, scientific approaches to creative processes in response to the complexities of post-World War II engineering and industrial design challenges. This movement was catalyzed by the Conference on Design Methods held in London in 1962, organized by the Imperial College of Science and Technology, where pioneers like J. Christopher Jones and L. Bruce Archer advocated for structured methodologies to decompose problems and synthesize solutions, marking a shift from intuitive to rational design practices.^[19] Influenced by organizational theorist Herbert Simon, whose work emphasized decision-making and problem-solving as core to artificial systems, the movement laid the groundwork for conceptual design by promoting iterative phases of analysis, ideation, and evaluation across disciplines.^[19] In engineering and architecture during the mid-20th century, conceptual design evolved as a critical early phase to explore high-level ideas before detailed implementation, with notable early adoption in aerospace programs. For instance, NASA's Apollo program, initiated amid the late 1950s space race and formalized in 1961, incorporated conceptual design phases starting with a feasibility study from July 1960 to May 1961, followed by mission architecture decisions like the lunar orbit rendezvous mode selected in December 1962, enabling rapid prototyping of spacecraft configurations through mockups and simulations.^[20] This approach in Apollo exemplified how conceptual design facilitated risk assessment and innovation under tight deadlines, influencing subsequent engineering practices by prioritizing feasibility and adaptability.^[20] A foundational publication in this evolution was Herbert Simon's The Sciences of the Artificial (1969), which established design as a science of artificial systems—goal-oriented constructs interfacing with environments—providing a theoretical framework for conceptual modeling that integrated information processing, optimization, and human cognition to guide the creation of complex artifacts.^[21] The 1980s and 1990s saw further transformation through the rise of computer-aided design (CAD) tools, which transitioned conceptual design from manual sketching to digital prototyping, enabling 3D modeling and simulation to accelerate ideation and reduce iteration times in fields like architecture and manufacturing.^[22] Post-2000, conceptual design has integrated with agile methodologies, originating in software development in the late 1990s but expanding to product design via minimum viable product (MVP) concepts introduced by Frank Robinson in 2001, emphasizing iterative feedback loops for faster validation of ideas.^[23] Concurrently, AI-assisted ideation has emerged, particularly with tools like ChatGPT advancing since 2021, to automate initial concept generation and enhance efficiency in agile frameworks by analyzing data and suggesting prototypes.^[23]

Role in the Design Process

Position in the Overall Design Cycle

Conceptual design serves as the initial formal phase in the engineering design process, following requirements gathering and research, where high-level ideas are explored to address identified needs before advancing to preliminary and detailed design stages.^[24] This positioning allows for the establishment of viable solution directions early, minimizing downstream revisions by focusing on broad architectural choices rather than specific implementations.^[25] In linear models like the waterfall methodology, conceptual design aligns with the early stages of system design, where requirements are translated into initial architectures after analysis but before implementation and verification phases.^[26] In contrast, iterative approaches such as design thinking integrate conceptual elements across cycles, particularly in the ideate stage following empathize and define, enabling repeated refinement through prototyping and testing to evolve concepts collaboratively.^[18] Key inputs to conceptual design include stakeholder requirements, which capture user needs and constraints, alongside market analysis to assess external factors like competition and viability.^[27] Outputs, such as concept sketches and high-level models, transition into feasibility studies during preliminary design, where technical and economic assessments validate the selected directions for further development.^[28] Relative to later phases, conceptual design typically consumes 10-20% of total project effort but influences 70-80% of life-cycle costs, as decisions on form, function, and architecture lock in manufacturing, materials, and operational expenses according to axiomatic design principles.^[29] This disproportionate impact underscores its role in risk mitigation and value creation, often prioritizing feasibility assessment to ensure alignment with objectives like performance and sustainability.^[30] The overall design cycle can be outlined textually as a progression: beginning with problem definition and requirements elicitation, advancing to conceptual design for idea generation and selection, proceeding through preliminary design for feasibility refinement, detailed design for specifications and prototyping, implementation for production, and concluding with testing, deployment, and iteration as needed in agile contexts.^[15] This flow ensures systematic evolution from abstract concepts to tangible outcomes, with feedback loops in modern variants to revisit earlier stages.^[18]

Key Objectives

The key objectives of conceptual design center on generating a diverse set of viable alternatives that address the core problem while aligning closely with user needs, project constraints, and broader requirements, thereby laying the foundation for detailed development in later phases. This phase aims to produce concepts that not only explore innovative solutions but also ensure practicality by incorporating stakeholder expectations and functional specifications from the outset. By establishing a clear roadmap—often through preliminary sketches, models, or descriptions—these objectives facilitate seamless transition to embodiment and detailed design, minimizing ambiguities downstream. Positioned early in the overall design cycle, conceptual design serves as the strategic pivot for innovation without committing to irreversible decisions. A critical objective is risk mitigation, achieved by identifying potential technical, functional, or integration issues at an early stage to prevent expensive redesigns and project delays in subsequent phases.^[31] This involves scrutinizing concepts for failure modes, resource dependencies, and compatibility with constraints, fostering designs that balance creative exploration with engineering feasibility.^[31] For instance, methods like the Risk in Early Design (RED) approach enable designers to evaluate variables influencing failures, such as material choices or subsystem interactions, ensuring concepts are robust yet adaptable.^[31] Success in conceptual design is measured qualitatively through criteria emphasizing novelty alongside feasibility, including originality of ideas, usability for end-users, and strong alignment with project scope and objectives. Concepts are assessed for their ability to inspire innovative "what if" scenarios via divergent thinking, which encourages broad ideation before convergent refinement to select promising options. Quantitatively, the phase typically targets refining a manageable number of high-potential concepts from an initial pool generated through brainstorming or morphological analysis, providing a diverse set for further evaluation.^[32] This strategic focus on exploration and validation underscores conceptual design's role in driving high-impact innovation while safeguarding project viability.

Steps in Conceptual Design

Problem Definition and Research

Problem definition serves as the foundational step in conceptual design, where the core challenge is articulated to ensure alignment between stakeholder expectations and design goals. This involves crafting clear problem statements that outline the "what" of the issue, often using tools such as user personas to represent target users' characteristics, needs, and contexts. In engineering contexts, this phase translates customer needs into functional and performance specifications while identifying constraints like budget, materials, or regulations to narrow the design space.^[33] Research methods in this phase gather foundational data to inform the problem framing, employing techniques such as direct user interviews, which are highly efficient for uncovering needs (identifying approximately 20% of needs from a single respondent), observations in real-use environments, and focus groups for group dynamics insights. Additional approaches include market analysis to assess trends and demands, competitor benchmarking to evaluate existing solutions, and literature reviews to synthesize prior knowledge on constraints and opportunities. These methods help reveal user pain points, technical limitations, and external factors, ensuring the design addresses real-world viability.^[34] The outputs of problem definition and research typically include a prioritized list of requirements—distinguishing functional needs (e.g., core performance criteria) from non-functional ones (e.g., usability or sustainability)—along with initial assumptions about feasibility and a tailored SWOT analysis to evaluate internal strengths/weaknesses against external opportunities/threats. For instance, in UX design, empathy mapping visualizes user perspectives across "says," "thinks," "does," and "feels" quadrants to pinpoint emotional and behavioral insights, thereby refining the problem statement to focus on unmet needs. This phase often consumes a substantial portion of the conceptual design timeline, with iterative loops to incorporate emerging insights from ongoing research, ultimately setting the stage for ideation.^[34]^[35]^[36]

Ideation and Brainstorming

Ideation in conceptual design represents the divergent phase where designers generate a wide array of potential solutions to the defined problem, emphasizing creative exploration over immediate feasibility. This process relies on divergent thinking, a cognitive approach that encourages the production of multiple, varied ideas to foster innovation and avoid premature convergence on suboptimal solutions.^[37] Building on prior problem research, ideation sessions typically aim for quantity over quality, with teams encouraged to produce at least 50 ideas per session to increase the likelihood of novel concepts emerging from the volume.^[38] Brainstorming serves as a core technique in this phase, often conducted in group settings to leverage collective creativity while adhering to established rules that promote openness. Originating from Alex Osborn's foundational work, effective brainstorming prohibits criticism of ideas during generation, welcomes unconventional or "wild" suggestions, and urges participants to build upon or combine others' contributions, thereby deferring judgment to enhance idea flow. Solo alternatives, such as mind mapping developed by Tony Buzan, allow individuals to visually branch out associations from a central problem theme, using keywords, images, and colors to stimulate nonlinear thinking and uncover hidden connections. Variants like SCAMPER further structure ideation by prompting systematic modifications: Substitute components, Combine elements, Adapt to new contexts, Modify attributes, Put to other uses, Eliminate unnecessary parts, or Reverse/Reverse roles, helping designers reframe existing ideas creatively. To capture and organize the influx of ideas, designers employ simple visualization tools that facilitate clustering and pattern recognition without imposing rigid structure. Analog methods, such as sticky notes on physical walls, enable quick jotting, grouping by theme, and physical rearrangement to reveal relationships among concepts. Digital whiteboards offer similar functionality in remote or hybrid settings, allowing real-time collaboration through virtual notes that can be dragged, colored, and linked for initial visualization.^[39] Incorporating diversity through multidisciplinary teams is crucial during ideation to broaden perspectives and mitigate risks like groupthink, where homogeneous groups suppress dissenting views in favor of consensus. By including experts from varied fields—such as engineering, psychology, and marketing—teams generate more robust idea pools, as diverse backgrounds challenge assumptions and spark cross-domain insights, ultimately enhancing creative output.^[40] Once a substantial set of ideas is generated, the ideation phase transitions to refinement by selecting a shortlist of top concepts through informal, intuitive assessments of their alignment with project objectives, such as user needs or constraints, setting the stage for deeper evaluation without exhaustive analysis at this point.^[37]

Concept Development and Evaluation

Concept development in conceptual design involves transforming raw ideas generated during ideation into more tangible representations, such as sketches, storyboards, or low-fidelity models, to explore and refine potential solutions.^[41]^[42] These initial visualizations allow designers to externalize abstract thoughts, identify relationships between components, and simulate user interactions without committing to high-cost implementations. Low-fidelity prototypes, in particular, facilitate rapid iteration by emphasizing core functionalities over aesthetic details, enabling teams to test assumptions early.^[43] To manage complexity, similar ideas are typically grouped and clustered into 3-5 distinct concepts, narrowing the focus to the most promising directions while preserving diversity.^[44] This convergence step draws briefly from the divergent outputs of ideation and brainstorming, synthesizing them into coherent alternatives that can be further developed. For instance, in engineering contexts, concepts may be represented through block diagrams that outline system interactions, flows, and interfaces at a high level.^[45]^[46] Evaluation of these developed concepts relies on established criteria to assess their overall potential, including feasibility (technical and economic realizability), desirability (user appeal and alignment with needs), and viability (market fit and sustainability).^[47]^[48] These dimensions ensure a balanced assessment, preventing overemphasis on any single aspect. Tools such as scoring matrices or the Pugh analysis method are commonly employed for systematic comparison, where concepts are rated relative to a baseline or against weighted criteria, using symbols like "+", "-", or "S" (same) to denote advantages, disadvantages, or neutral performance.^[49]^[50] The Pugh method, in particular, promotes controlled convergence by iteratively refining evaluations to avoid premature elimination of innovative ideas.^[49] The process is inherently iterative, involving cycles of development, feedback from stakeholders or simulations, and refinement to discard weaker concepts while merging strengths from others.^[51]^[52] This feedback loop, often informed by multidisciplinary reviews, helps evolve concepts toward greater robustness, with adjustments made based on identified gaps in feasibility or desirability.^[53] Multiple rounds may be necessary to achieve convergence, ensuring that surviving concepts address the problem holistically. The primary outputs of this phase are refined concept documents that detail each alternative, including visual aids, pros and cons relative to criteria, and recommendations for progression to detailed design or further testing.^[44] These documents serve as bridges to subsequent stages, providing a clear rationale for selection and highlighting risks or opportunities for enhancement. In engineering applications, such outputs might include annotated block diagrams specifying key interactions, alongside quantitative scores from evaluation matrices to justify priorities.^[46] This structured documentation ensures traceability and supports informed decision-making in resource-constrained environments.^[51]

Methods and Techniques

Traditional Methods

Traditional methods in conceptual design encompass manual, low-technology techniques that have long facilitated the generation and visualization of ideas without reliance on computational tools. These approaches prioritize rapid iteration, creativity, and tangible exploration, allowing designers to externalize thoughts and evaluate concepts early in the process.^[54] Sketching and drawing serve as foundational techniques, involving hand-drawn representations to quickly capture and iterate visual concepts, where the emphasis lies on speed and expressiveness rather than technical precision. This method enables designers to explore forms, proportions, and spatial relationships intuitively, often using simple tools like pencils and paper to generate multiple variations in a short time. Sketches act as a bridge between abstract ideas and more refined developments, fostering divergent thinking by making ambiguities and possibilities explicit.^[55]^[56] Morphological analysis, pioneered by astronomer Fritz Zwicky in the mid-20th century, involves decomposing a design problem into key sub-functions or attributes and systematically combining potential solutions within a matrix framework, such as 2x2 grids for pairing attributes. This structured yet combinatorial approach generates a comprehensive set of feasible concepts by exhaustively mapping alternatives, helping designers avoid overlooking viable combinations while maintaining an overview of the solution space. It is particularly effective for complex, multi-dimensional problems in engineering, where it promotes systematic creativity over random ideation.^[57]^[58] Analogies and biomimicry draw inspiration from natural phenomena or existing designs to generate novel concepts, leveraging cross-domain transfers to address engineering challenges innovatively. In biomimicry, designers observe biological systems—such as the structure of bird wings for aerodynamic efficiency—and adapt these principles to human-made solutions, encouraging sustainable and efficient outcomes. This technique, popularized in the late 20th century, stimulates breakthrough ideas by reframing problems through unfamiliar lenses, often leading to elegant, function-oriented designs.^[59]^[60] Paper prototyping employs low-cost materials like cardboard, foam, or paper to construct physical mockups that test form, function, and user interaction in the conceptual phase. These tangible models allow for hands-on evaluation of ergonomics, assembly, and usability without significant investment, enabling quick modifications based on feedback. By simulating real-world conditions, paper prototypes bridge the gap between ideation and validation, revealing practical issues early.^[61]^[62] These methods were prevalent throughout the 20th century in engineering and product design, forming the core of training programs and professional practice before the widespread adoption of digital tools, and they remain essential for building foundational skills in conceptual thinking.^[54]^[63]

Modern Tools and Approaches

Modern tools and approaches in conceptual design leverage digital technologies to accelerate ideation, evaluation, and iteration, enabling designers to explore complex possibilities with greater precision and collaboration. These advancements, emerging prominently since the early 2000s, integrate computational power to handle vast design spaces that surpass manual methods, fostering innovation across disciplines like engineering and user experience design.^[64] Computer-aided design (CAD) software has become essential for rapid 3D modeling in early conceptual stages. Tools like SketchUp allow designers to create intuitive, low-fidelity 3D representations of concepts, facilitating quick visualization and spatial exploration without steep learning curves.^[65] Similarly, in user experience (UX) design, platforms such as Figma support collaborative wireframing, where teams can build and refine low-fidelity layouts in real-time, aligning on user flows and interface structures efficiently.^[66] Generative design, powered by artificial intelligence (AI) and machine learning algorithms, automates the exploration of thousands of design variations based on predefined constraints like material properties, weight, and performance goals. Autodesk's generative design tools, integrated into software like Fusion 360, enable this process by iteratively optimizing outcomes, allowing designers to select feasible concepts from a broad array generated computationally.^[64] In the automotive sector, for instance, Kia Global Design collaborated with Autodesk in 2024 to use generative AI for wheel concept generation, reducing design time and enhancing creativity by proposing novel options aligned with aesthetic and functional criteria.^[67] Virtual reality (VR) enhances immersive concept testing by simulating environments where designers and stakeholders can interact with 3D models in real scale. This approach strengthens three-dimensional spatial understanding and engagement during ideation, as demonstrated in engineering design studies where VR prototypes facilitate fluid idea generation and early validation.^[68] Data analytics complements these tools by predicting design trends through pattern recognition in historical and market data. Methods like semantic projections in trend forecasting analyze conceptual shifts, informing initial problem definitions and ensuring concepts align with emerging preferences.^[69] Collaborative platforms such as Miro and Mural streamline remote brainstorming with features for real-time idea mapping, voting, and clustering. Miro's digital canvas, for example, supports structured sessions where teams visualize concepts, prioritize ideas, and iterate collectively, improving decision-making in distributed workflows.^[70] These tools collectively offer scalability and rapid iteration, allowing design teams to test multiple scenarios efficiently; in 2020s automotive applications, AI-assisted generation has accelerated concept development through optimized exploration and reduced prototyping costs.^[71]

Applications Across Disciplines

Engineering and Product Design

In engineering and product design, conceptual design emphasizes functional decomposition to break down the overall system function into manageable sub-functions, particularly for mechanical and electrical components, enabling engineers to generate feasible solutions early without premature constraints. This approach facilitates a structured exploration of how individual elements interact to achieve desired performance. Trade-off analysis complements this by systematically evaluating alternatives across criteria such as cost, weight, reliability, and efficiency in mechanical and electrical systems, ensuring balanced decisions that align with project goals. A prominent example is Boeing's conceptual design phase for advanced aircraft configurations, such as the truss-braced wing demonstrator in the X-66A project (paused as of April 2025), where scaled wind tunnel models and computational material simulations were employed to refine aerodynamic performance, predict structural loads, and iterate on wing shapes for reduced drag and fuel consumption.^[72] These techniques allow for rapid validation of airframe concepts before advancing to detailed engineering. A key focus in this phase is integrating manufacturability and safety standards from the initial stages, often through Quality Function Deployment (QFD) matrices that map customer needs to technical requirements, including process capabilities for production feasibility and risk assessments for compliance with regulatory standards like those from the FAA or ISO. QFD ensures that design choices prioritize ease of assembly, material selection for durability, and inherent safety features, such as fault-tolerant electrical systems, thereby minimizing downstream revisions. The primary outcomes of conceptual design in this domain are proof-of-concept prototypes, typically low-fidelity models or simulations that empirically validate physics-based assumptions, such as stress distributions in mechanical parts or power flow in electrical circuits, confirming viability before resource-intensive development. In consumer electronics, such as iterative smartphone designs, effective conceptual practices have been reported to reduce overall development time by front-loading critical evaluations and avoiding costly late-stage changes.

Architecture and Urban Planning

In architecture and urban planning, conceptual design serves as the foundational phase where architects and planners translate abstract ideas into tangible spatial configurations, adapting to site-specific constraints and opportunities. Site analysis is a critical starting point, evaluating factors such as topography, climate, access, and existing infrastructure to inform design decisions.^[73] Zoning regulations are integrated early to ensure compliance with land use policies, density limits, and building codes, preventing later revisions. Massing studies, often represented through volumetric block models or digital simulations, explore building forms, scale, and spatial relationships, allowing designers to test how structures interact with their surroundings and optimize sunlight, views, and circulation.^[74]^[75] These techniques enable iterative exploration of form without committing to detailed construction, emphasizing harmony between the built environment and its context.^[76] Key elements of conceptual design in this field include environmental impact assessments (EIAs) and stakeholder visualizations to promote sustainability and inclusivity. EIAs conducted during the conceptual stage quantify potential effects on ecosystems, energy use, and carbon emissions, guiding choices in materials and orientation to minimize ecological footprints from the outset.^[77] For instance, assessments evaluate how a project's massing influences microclimates or biodiversity, informing adjustments for reduced environmental harm. Stakeholder visualizations, typically through photorealistic renderings or 3D models, facilitate communication with communities, officials, and investors by depicting proposed flows of people, vehicles, and natural elements, fostering consensus on usability and aesthetic integration.^[78]^[79] Conceptual design operates across scales, from individual buildings to expansive city districts, prioritizing pedestrian flow, public usability, and communal vitality. In single-building projects, it focuses on internal spatial dynamics and site adjacency, while urban plans address networked infrastructure like transit hubs and green corridors to enhance connectivity. Representative examples illustrate this approach: Zaha Hadid's early conceptual sketches employed explosive, fluid forms to challenge rectilinear norms, as seen in her abstract paintings that evolved into dynamic architectural volumes like the Heydar Aliyev Center.^[80] Similarly, Singapore's Smart Nation initiative integrates conceptual urban planning with sustainability, using data-driven massing and zoning to create resilient districts that optimize resource efficiency and livability through features like vertical greenery and adaptive infrastructure.^[81] Since the 2010s, trends in conceptual design have increasingly incorporated green principles, such as biophilic elements and passive strategies, to address climate challenges in built environments. Massing studies now routinely simulate energy performance and incorporate native vegetation to reduce urban heat islands, reflecting a shift toward regenerative designs that enhance biodiversity alongside human needs.^[82] This evolution underscores conceptual design's role in creating resilient, low-impact urban landscapes.^[83]

Software and UX Design

In software and user experience (UX) design, conceptual design adapts principles from broader disciplines to create intuitive digital interfaces that prioritize user needs over technical constraints. This involves early-stage exploration of how users interact with applications, emphasizing iterative ideation to align product concepts with real-world behaviors. Unlike physical product design, the focus here is on intangible flows, such as navigation and engagement, to ensure seamless digital experiences.^[84] A key adaptation is the use of user journey mapping and information architecture (IA) to conceptualize application flows. User journey mapping visualizes the steps a user takes to achieve a goal, identifying pain points and opportunities for enhancement during the conceptual phase.^[84] Complementing this, IA organizes content and functionality into logical structures, such as sitemaps and wireframes, to guide the overall app architecture from inception.^[85] These techniques enable designers to prototype high-level concepts that support scalable user interactions, ensuring the design evolves from abstract ideas to testable models.^[86] Central to this process is the application of personas—fictional archetypes based on user research—to foster accessibility and intuitive interactions. Introduced by Alan Cooper in his 1999 book The Inmates Are Running the Asylum, personas represent diverse user types, helping teams empathize with varying needs, such as those of novice versus expert users, to create inclusive designs.^[87] By incorporating personas, conceptual design addresses scalability, ensuring interfaces remain usable as user bases grow and accessibility standards, like WCAG guidelines, are met from the outset.^[88] An illustrative example is the early conceptual design of Airbnb's mobile app, where wireframing focused on search and booking flows informed by user behavior data. Founders used low-fidelity sketches to iterate on concepts like dynamic listing previews, drawing from observations of traveler pain points to refine intuitive navigation.^[89] This approach validated core ideas through rapid feedback, transforming initial concepts into a user-centric platform that prioritized trust and ease. Brief brainstorming sessions for feature ideation further supported these iterations, ensuring alignment with emerging user needs. Conceptual design in software and UX integrates with Agile methodologies through short sprints dedicated to concept validation, often using A/B testing on mockups. In Agile UX, designers embed user testing within two-week sprints, comparing prototype variants to measure engagement metrics like task completion rates.^[90] This framework, as outlined in the FRAMUX-EV model, facilitates continuous refinement, balancing speed with user-centered outcomes.^[90] The 2020s have seen an evolution toward no-code tools for faster prototyping in UX conceptual design, democratizing access beyond traditional coding. Platforms like Bubble and Adalo allow drag-and-drop creation of interactive mocks, accelerating iteration cycles and enabling non-technical stakeholders to contribute. This shift, driven by low-code/no-code (LCNC) advancements, has significantly reduced prototyping time in some cases, fostering collaborative conceptual work while maintaining focus on user flows.

Challenges and Best Practices

Common Challenges

One prevalent challenge in conceptual design is creativity blocks, particularly design fixation, where designers become overly attached to initial ideas, hindering the generation of novel concepts and promoting premature convergent thinking. This fixation often arises from exposure to early examples or self-generated concepts that constrain subsequent ideation, leading to a narrower range of solutions and reduced innovation potential.^[91] In engineering contexts, such blocks can limit the exploration of diverse configurations, resulting in suboptimal outcomes during the early phases of product development.^[92] Resource constraints, including limited time and budget, frequently impede thorough exploration in the conceptual design phase, compelling teams to rush evaluations and settle on underdeveloped ideas. These limitations can commit up to 60-80% of a project's final cost by the end of this stage, amplifying downstream inefficiencies if initial concepts are inadequately vetted.^[93] In resource-scarce environments, such as educational or early-stage engineering projects, designers must navigate trade-offs that prioritize feasibility over creativity, often truncating brainstorming sessions and iterative refinement.^[94] Team dynamics pose significant obstacles in multidisciplinary conceptual design, where conflicts emerge from differing disciplinary perspectives, communication gaps, and ego-driven disagreements, disrupting collaborative idea generation. For instance, engineering team members may emphasize technical feasibility, while design counterparts focus on user-centered innovation, leading to unresolved tensions that stall progress and fragment group cohesion.^[95] Remote or distributed teams exacerbate these issues through misaligned goals and reduced spontaneous interaction, further complicating the integration of diverse inputs into cohesive concepts.^[96] Managing uncertainty is a core difficulty, as ambiguous or evolving requirements during conceptual design create unclear problem boundaries, fostering indecision and inconsistent interpretations among stakeholders. This ambiguity often stems from ill-defined client needs or complex project contexts, requiring designers to frame problems without full information, which can propagate errors into later stages.^[97] In non-routine scenarios, such uncertainties demand adaptive approaches to stakeholder involvement, yet persistent evolution of requirements mid-phase can derail alignment and inflate revision cycles.^[98] Poor conceptual alignment contributes to scope creep in up to 52% of projects, where uncontrolled expansions beyond initial boundaries lead to delays, budget overruns, and diminished success rates. This phenomenon frequently originates from vague early-phase definitions, allowing incremental changes to accumulate without rigorous control, ultimately compromising project delivery.^[99] Such misalignment not only erodes efficiency but also heightens risks in high-stakes endeavors like product development.^[100] These challenges can be mitigated through targeted best practices in subsequent phases.

Best Practices

Fostering iteration is a cornerstone of effective conceptual design, involving the scheduling of multiple review cycles that incorporate diverse feedback to progressively refine concepts. In engineering contexts, this can be achieved through structured loops, such as analyzing problems, generating ideas, composing concepts, and evaluating them, with oscillations between intuitive and analytical cognitive modes to produce both derivative and innovative outcomes.^[101] NASA's approach exemplifies this by employing three iterative cycles (e.g., A, B, C designs) to explore bounding cases and apply learnings without retrofitting earlier work, ensuring convergence toward feasible solutions.^[102] Such cycles mitigate risks of premature fixation and enhance design quality by revisiting decisions cyclically.^[103] Thorough documentation supports seamless transitions from conceptual to detailed phases by maintaining version-controlled records of ideas, decisions, and analyses. Standardized templates for subsystem reports at the end of each iteration cycle, as used in space systems design, facilitate traceability and knowledge sharing among teams.^[102] Informal configuration control by a designated engineer ensures consistency without stifling agility, while clear summaries capturing project vision, goals, and key elements prevent information loss.^[102] This practice not only aids collaboration but also provides a baseline for future iterations or audits. Balancing divergence and convergence is essential for comprehensive coverage, with recommended time allocations such as 60% for ideation (divergence) and 40% for evaluation (convergence) to generate diverse options before refining them. In UX workshops, divergence involves independent generation of ideas—often timeboxed to 5–10 minutes to prioritize quantity—followed by group convergence to cluster and prioritize, reducing bias and fostering synergy.^[104] This structured alternation, rooted in design thinking, ensures broad exploration without overwhelming resources, as seen in processes where divergence opens possibilities and convergence narrows to practical decisions.^[105] Encouraging inclusivity from the outset involves applying inclusive design principles to incorporate varied user perspectives, recognizing exclusion early and learning from diversity to shape robust concepts. Microsoft's methodology emphasizes centering people with diverse abilities, such as designing for one specific need (e.g., permanent disabilities) to extend benefits universally, which broadens applicability during conceptual exploration.^[106] The UK Design Council's principles further advocate placing people at the heart of the process, reflecting diversity to remove barriers and create equitable designs.^[107] This proactive integration prevents downstream rework and aligns concepts with real-world needs. These practices address common challenges by promoting structured yet flexible workflows that enhance outcomes. To measure success, conduct post-phase reviews using key performance indicators (KPIs) such as concept adoption rate—which tracks how many generated concepts advance to development—and innovation index, assessing novelty and impact relative to benchmarks.^[108]^[109] In engineering, feasibility is gauged by convergence to first-order accuracy (e.g., ±10% error) and the presence of significant surprises indicating thorough exploration.^[102]

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Conceptual Design - an overview | ScienceDirect Topics
In this chapter, conceptual design is considered an important activity in CE and the statements of many product design and development experts supported the ...
[15]
[PDF] EPICS Design Process Document - Purdue Engineering
Conceptual Design Phase ... The first phase of the design process is Project Identification. The goal of ...
[16]
AIdeation: Designing a Human-AI Collaborative Ideation System for ...
The concept design workflow consists of two main phases [1, 64, 73]: 1) early ideation (or blue sky) phase, where raw ideas are researched, brainstormed, and ...
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UX Design: From Concept to Prototype - Coursera
This course teaches how to define problems, create user stories, develop prototypes, and use techniques like sketching and wireframing to create a compelling ...
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https://www.interaction-design.org/literature/article/5-stages-in-the-design-thinking-process
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[PDF] ddo_designprocess.pdf - Dubberly Design Office
engineering project management, academic designers imported both methods and philosophy in what became known as the design methods movement (1962-1972).
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[PDF] The Apollo Spacecraft: A Chronology Volume 2 - NASA
Mar 24, 2023 · By late 1962 the broad conceptual design of the Apollo spacecraft and the Apollo lunar landing mission was complete.
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The Sciences of the Artificial - MIT Press
The Sciences of the Artificial reveals the design of an intellectual structure aimed at accommodating those empirical phenomena that are “artificial” rather ...
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How CAD Has Evolved Since 1982 - Scan2CAD
Jan 12, 2024 · The period between 1980 and 1989 was perhaps the most significant as regards the evolution of the CAD industry. Not only did many CAD software ...History of CAD · CAD in the 21st Century · Global Impact of CAD
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Agile Design and AI Integration: Revolutionizing MVP Development ...
Aug 6, 2025 · This paper delves into the integration of Artificial Intelligence (AI) into the design process of Minimum Viable Products (MVPs) to enhance efficiency, quality ...Missing: ideation post-
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What Is the Engineering Design Process? An In-Depth Guide to ...
May 16, 2025 · Stages of the Engineering Design Process · Problem Identification · Research and Specification · Conceptual Design · Preliminary Design · Detailed ...Documentation And... · Design Documentation · Implementation And...Missing: transition | Show results with:transition
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Design Process - EPICS - Purdue University
Oct 28, 2025 · Conceptual Design Phase. In this phase, the teams evaluate the general design of their product, leaving the smaller details for the next phase.
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Waterfall Model - Software Engineering - GeeksforGeeks
Sep 30, 2025 · The waterfall model is a Software Development Model used in the context of large, complex projects, typically in the field of information technology.Spiral Model · Iterative Waterfall · Software Design Document · Project Management
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4.1 Stakeholder Expectations Definition - NASA
Jul 26, 2023 · 1.1 Inputs. Typical inputs needed for the Stakeholder Expectations Definition Process include the following: Initial Customer Expectations: ...<|separator|>
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23.1 Overview of Design Process - BRT Planning Guide
Once the preferred conceptual layout has been determined, the design can proceed to the preliminary design stage, where the following tasks should be undertaken ...
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[PDF] EVALUATING PRODUCT CONCEPTS THROUGH AXIOMATIC ...
Study revealed that about 70%–80% of the product life cycle cost is determined in conceptual design.
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Introduction to Axiomatic Design Concepts - Functional Specs, Inc.
Jul 5, 2022 · Axiomatic design technology reduces product development risk, reduces cost and speeds time to market by: Formalizing the conceptual design ...
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A Step toward Risk Mitigation during Conceptual Product Design
Aug 1, 2011 · The objective of this article is to introduce a method that will mitigate product risks during the conceptual design phase by identifying design ...
[32]
Towards an 'ideal' approach for concept generation - ScienceDirect
The aim of conceptual design is to develop promising concepts. This requires generating a wide range of concepts (to prevent overlooking valuable concepts), and ...
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Problem Definition | Engineering Design - McGill University
Problem definition is an essential initiating phase of any product development. In this phase you must: understand existing problem, associating available ...
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[PDF] Identifying Customer Needs - DSpace@MIT
Eppinger. 2nd edition, Irwin McGraw-Hill, 2000. Chapter Table of Contents. 1. Introduction. 2. Development Processes and Organizations. 3. Product Planning.
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SWOT Analysis - NN/G
Feb 7, 2025 · A SWOT analysis is a strategic tool to determine how well a product, service, or organization is positioned in the market to serve its customers.Definition · Example Of Swot Analysis · How To Use A Swot Analysis...
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Empathy Mapping: The First Step in Design Thinking - NN/G
Jan 14, 2018 · Empathy maps should be used throughout any UX process to establish common ground among team members and to understand and prioritize user needs.Format of an Empathy Map · Why Use Empathy Maps
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The relationship between divergent thinking and ideation in the ...
This paper constructs a detailed investigation of the ways divergent thinking and ideation occur in the design process.
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https://www.ideou.com/blogs/inspiration/brendan-boyle-on-divergent-thinking-and-the-innovation-funnel
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Ideation for Everyday Design Challenges - NN/G
Jan 15, 2017 · The ideation process takes shape in many forms: it can be done alone or in a group, in-person or remotely, the session can be short or span ...
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Design thinking teams and team innovation performance
Dec 4, 2023 · A typical DT process begins with the formation of heterogeneous teams that seek deep user understanding.
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Methods - Digital.gov
A storyboard forces you to think through the tough transitions, invisible moments, and entire cast of people who will need to interact with your design concept.
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Prototypes and Concept Design | CS4760 & CS5760
Concept design is understood in industry as a specific document. It is the integrated ideas describing the system: appearance, function and how the user ...
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[PDF] LOW TO HIGH FIDELITY PROTOTYPING
CONCEPTUAL MODELS &. CONCEPTUAL DESIGN: • conceptual model = the foundation of the interface. different user interfaces could be built upon it.
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[PDF] Concept Selection - MIT OpenCourseWare
Beware of the best "average" product. • Perform concept selection for each different customer group and compare results. • Check sensitivity of selection to the ...Missing: evaluation | Show results with:evaluation
[45]
[PDF] A Computational Model for Conceptual Design Based on Function ...
Abstract. Function logic and function block diagrams have been successfully employed in preliminary and conceptual design processes for several decades.
[46]
Conceptual Design Review (CDR) - BYU Capstone
1. Project Overview. Briefly describe the problem your project aims to solve. Briefly provide overview of Key Success Measures. · 2. Architecture Summary.Missing: objectives | Show results with:objectives
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What Is Human-Centered Design? - HBS Online
Dec 15, 2020 · Three characteristics of human-centered design that are vital to consider when critiquing ideas are desirability, feasibility, and viability.
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A Design Thinking, Systems Approach to Well-Being - NCBI - NIH
Desirability, feasibility, and viability describe the issues to be discussed during a design thinking process. The process itself, said Kreitzer, can be ...
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(PDF) An Evaluation of the Pugh Controlled Convergence Method
This paper evaluates a method known as Pugh Controlled Convergence and its relationship to recent developments in design theory.
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How to Get the Most Out of an Evaluation Matrix
Jan 28, 2020 · Evaluation matrices are often used as decision matrices aimed at helping teams decide which one of the generated concepts to choose.
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[PDF] Techniques for Conducting Effective Concept Design and Design-to ...
The NASA Mission Design Process, An Engineering. Guide to the Conceptual Design, Mission Analysis and Definition Phases. Washington,. DC (US): NASA ...
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Iteration: The most important concept in design
Jul 31, 2020 · This iterative and synergistic interplay between creation and evaluation is the basic process of design found in all creative fields.
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[PDF] Feedback in concept development: Comparing design disciplines
Convergent thinking is necessary to evaluate, synthesize, and select the most promising ideas, and ultimately the concept that will become the final design. ...
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Conceptual Design in Engineering: Ancient to AI Innovation
These principles guide engineers through the process of designing automobiles that meet performance, safety, and regulatory requirements:
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Why is Sketching (Still) Important (To Design)? - Core77
Jun 6, 2016 · Sketching is important for expressing ideas, exploring solutions, and developing understanding of the design problem, enabling generative ...Design As A Process · Sketching Concept · Taxonomy Of Design SketchesMissing: traditional | Show results with:traditional
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(PDF) Conceptual Design and Analysis By Sketching - ResearchGate
Aug 6, 2025 · In this article we hypothesize that the key to enabling systems to reason and communicate about conceptual design is the language of sketching.
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[PDF] Fritz Zwicky, Morphological Analysis and Futures Studies
This article outlines the fundamentals of the morphological approach and describes an application in policy analysis. Keywords – general morphological analysis, ...
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[PDF] Morphological Analysis (MA) leading to Innovative Mechanical Design
In this paper we apply Morphological Analysis (MA) to a conceptual design where the designer is attempting to exhaustively search a manageably defined design ...<|control11|><|separator|>
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Biomimicry: Innovation Inspired By Nature
By Biomimicry 3.8 co-founder Janine Benyus, this book details how designers and scientists are studying Nature's genius to solve our toughest challenges.
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Oct 31, 2017 · The practice of borrowing ideas from other domains to solve technical challenges is called design by analogy. It is a technique widely applied by innovators.
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[PDF] PROTOTYPES IN ENGINEERING DESIGN: DEFINITIONS AND ...
Introduction. Prototypes are essential in product development. They can help to create, explore, describe, test and analyse the item being designed.
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Novice designers' use of prototypes in engineering design
In this paper, we describe how novice designers conceptualized prototypes and reported using them throughout a design project.
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(PDF) The evolution of design methods - ResearchGate
This paper presents the development of design models in order to contribute to a greater understanding of the methodology for design projects with caution to ...
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What is Generative Design | Tools Software - Autodesk
Generative design is an advanced, algorithm-driven process, sometimes enabled by AI, used to explore a wide array of design possibilities.
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Free Online Wireframe Tool For Teams | Figma
Visualize your ideas as wireframes and share them with others so you can collaborate and align on flows and layouts, together.
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Kia Global Design explores generative AI for automotive design
Nov 6, 2024 · The generative AI tool developed by Kia Global Design and Autodesk Research proposed wheel options that helped accelerate the design process.
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Design Trend Forecasting by Combining Conceptual Analysis and ...
In this paper, we describe a new trend analysis and forecasting method (Deflexor), which is intended to help inform decisions in almost any field of human ...
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Collaborative Brainstorming | Miro
Oct 2, 2025 · Summary. In this guide, you will learn: How to set up and use Miro's digital canvas and tools for collaborative brainstorming.
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Sep 24, 2025 · Discover how generative AI in automotive cuts downtime by 67% & boosts leads by 37%. Explore top use cases from BMW, Toyota & more.Missing: 2020s | Show results with:2020s
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Architecture Site Analysis Guide - Data Collection to Presentation
An architectural site analysis process will look at issues such as site location, size, topography, zoning, traffic conditions and climate.
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Conceptual/Block Massing Analysis - RDT LLP
Conceptual Block Massing Analysis is a preliminary design process using volumetric representations to understand a project’s spatial layout and relationships.
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Understanding Massing Models in Architecture - Autodesk
Learn about massing models in architecture. Gain insights into their influence on design aesthetics, functionality, and environmental considerations.
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All About Architectural Site Analysis & Feasibility Study - Snaptrude
Dec 29, 2020 · You can create detailed master plans and zoning diagrams in massing mode, for analysis, recommendations and better management of the project. It ...
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Assessing environmental performance in early building design stage
Decisions made at early design stage have major impacts on buildings' life-cycle environmental performance. However, when only a few parameters are ...
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The role of environmental impact assessments in sustainable ...
The Environmental Impact Assessment (EIA) served as a valuable source of knowledge that guided design choices, provided feedback that could be acted upon, and ...
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From ideas to 3D: The power of conceptual design - Autodesk
Visualization tools like sketches, 3D models, and renderings help bring these ideas to life and communicate them with the clients and stakeholders. They also ...
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The Creative Process of Zaha Hadid, As Revealed Through Her ...
Feb 25, 2019 · Here we have made a historic selection of her paintings which expand the field of architectural exploration through abstract exercises in three dimensions.
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Insights from Smart City Initiatives for Urban Sustainability and ...
This paper provides a literature review to understand the implications of smart city initiatives for sustainable urban planning.
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Designing with nature: Advancing three-dimensional green spaces ...
Within the last two decades, the incorporation of vegetation into buildings has become a flourishing trend in contemporary urban architecture (Schröpfer and ...
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Explore Green Design Principles and Building Examples
Sep 10, 2024 · Green design is a comprehensive process intended to minimize the designed infrastructure's environmental impact and energy consumption.
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Journey Mapping 101 - NN/G
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What Is Information Architecture? | Figma
Learn what information architecture is, why it's important, and how to build information architecture faster with FigJam templates.Why information architecture is... · Eight principles of information...
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The Evolution of Information Architecture - Optimal Workshop
Jun 23, 2023 · An effective IA design approach leads to better user experiences as it ensures that information is presented in a logical and intuitive way.
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[PDF] Users: Personas and Goals - CMU School of Computer Science
The Essentials of Interaction Design. Alan Cooper and Robert Reimann. WILEY. Wiley Publishing, Inc. Page 3. Chapter 5. Modeling Users: Personas and Goals. The ...
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Defending Personas. If you love a design tool, set it free - Alan Cooper
Mar 9, 2021 · Illustrated UX design concept with two personas ... Software designer Alan Cooper explains why they call him the 'Father of Visual Basic'.
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How Design Thinking Transformed Airbnb from a Failing Startup to a ...
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FRAMUX-EV: A Framework for Evaluating User Experience in Agile ...
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(PDF) Low-Code/No-Code Platforms: From Concept to Creation
Aug 10, 2025 · This paper explores the evolution of LCNC platforms, from their origins in the 1980s and 1990s to their current state in the 2020s, highlighting ...
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Researchers study concept of design fixation - Phys.org
Mar 31, 2015 · What causes fixation varies from person to person, and from project to project, but common factors include a commitment to initial ideas, ...
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Fixation & Creativity in Concept Development: Expert Designers
Creative design thus involves the active modification or rejection of previously accepted ideas, ideas that might otherwise block progress. The term 'fixation' ...
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[PDF] Concept Generation Methods in Highly Constrained Design Problems
May 18, 2018 · Group brainstorming and a modified 6-3-5 method were used as a direct comparison, while a sketch modelling exercise was also incorporated to.
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[PDF] Incorporating Engineering Design Challenges into STEM Courses
Time constraints, political constraints, and human resource constraints must also be considered. In many respects, constraints impose the most restrictive ...
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[PDF] UNDERSTANDING CHARACTERISTICS OF MULTIDISCIPLINARY ...
Sep 7, 2018 · Conflict resolution was heavily seen in design concept maps. In comparison, engineering maps show the least sub-branches for conflict.
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A systematic review of empirical studies on multidisciplinary design ...
The study identified communication roles that enabled the team to collectively integrate multidisciplinary knowledge and to form boundary-spanning activities.
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[PDF] DEALING ITH UNCERTAINTY IN DESIGN PRACTICE: ISSUES FOR ...
Design problems are often complex and ambiguous and resist a comprehensive understanding. This can cause vague descriptions of the problem and goals in a ...
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(PDF) Managing uncertainty in design communication - ResearchGate
This paper argues that the widespread beliefthat ambiguity is beneficial in designcommunication stems from conceptual confusion.Communicating imprecise, ...
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Scope Patrol - PMI
Jun 30, 2018 · 52 percent of projects completed in the last 12 months experienced scope creep or uncontrolled changes to the project's scope—up from 43 percent ...
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Top Five Causes of Scope Creep - PMI
Oct 12, 2009 · Scope creep is a dreaded thing that can happen on any project, wasting money, decreasing satisfaction, and causing the expected project value to not be met.
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[PDF] Exploring Dual-Processes of Iteration in Conceptual Design*
The iteration design process model consisted of four key tasks (analyze problem, generate idea, compose concept, evaluate concept) and three loops (problem ...
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[PDF] Techniques for Conducting Effective Concept Design and Design-to ...
Conducted in pre-Phase A & Phase A of Project Life Cycle to provide “feasible” system level design baseline for new concept.
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https://www.interaction-design.org/literature/article/design-iteration-brings-powerful-results-so-do-it-again-designer
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The Diverge-and-Converge Technique for UX Workshops - NN/G
May 30, 2024 · The diverge-and-converge collaboration method has two stages: When team members diverge, they research, analyze, generate, or design independently.<|control11|><|separator|>
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What does design thinking feel like? | IDEO
Sep 7, 2008 · It is a series of divergent and convergent steps. During divergence we are creating choices and during convergence we are making choices.
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Microsoft Inclusive Design
Inclusive Design is a methodology that enables and draws on the full range of human diversity, including people with a range of perspectives.
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[PDF] The principles of inclusive design: they include you
Inclusive design makes places everyone can use, removing barriers, and places people at the heart of the design process. It reflects diversity and difference.
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6.12 Metrics and Key Performance Indicators | IIBA®
Metrics such as NPS, CES, Adoption Rate, and Retention Rates are used to better understand the customer perspective. Although metrics indicate a measurement ...
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[PDF] Berkeley Innovation Index : An Approach for Measuring and ...
Feb 22, 2016 · Berkeley Innovation Index is both a concept and an open project to offer simple ways to measure innovation, but in a holistic sense. These ...