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Analytic network process

The Analytic Network Process (ANP) is a multi-criteria decision-making (MCDM) methodology developed by Thomas L. Saaty that extends the Analytic Hierarchy Process (AHP) by incorporating interdependencies and feedback loops among decision elements, allowing for the modeling of complex problems as influence networks rather than strict hierarchies.^[1]^[2] Introduced in Saaty's 1996 book Decision Making with Dependence and Feedback: The Analytic Network Process, ANP addresses limitations in traditional hierarchical methods by representing decisions through clusters of interconnected elements, where influences flow in multiple directions, including loops that capture dynamic interactions.^[2] The core mechanism involves constructing a supermatrix—a mathematical structure that aggregates pairwise comparison judgments (using Saaty's 1-9 scale for relative importance) to derive priority weights, which are then stabilized through eigenvector calculations to yield limiting priorities for alternatives.^[1] This process typically proceeds in steps: identifying clusters and elements, performing paired comparisons to fill the supermatrix, weighting influences between and within clusters, and synthesizing results, often using software like SuperDecisions for computation and consistency checks (with a consistency ratio ideally below 0.1).^[3] Unlike AHP, which assumes independence between levels, ANP's network structure enables handling of non-linear relationships, making it suitable for scenarios with mutual influences, such as strategic planning or risk assessment.^[1] ANP has been widely applied across diverse fields due to its flexibility in integrating qualitative and quantitative factors. In project management and supplier selection, it prioritizes alternatives by accounting for criteria like cost, quality, and delivery under interdependent conditions.^[2] In healthcare, studies have used ANP to weigh shift work disorders (e.g., sleep disturbances over digestive issues) among hospital staff, demonstrating its utility in resource allocation amid feedback effects like fatigue impacting performance.^[3] Other notable applications include energy management for renewable source selection, environmental assessments for sustainability evaluations, and product design where customer preferences influence technical criteria bidirectionally.^[2] Advantages of ANP include its ability to manage intangible criteria and complex networks, providing robust, ratio-scale priorities that support group decision-making.^[1] However, it can be computationally intensive for large-scale problems and sensitive to judgment inconsistencies, requiring expert input for reliable outcomes.^[2] Overall, ANP remains a foundational tool in MCDM, with ongoing refinements enhancing its applicability in dynamic, real-world decisions.

Introduction

Definition and Overview

The Analytic Network Process (ANP) is a generalization of the Analytic Hierarchy Process (AHP) that addresses nonlinear, complex decision problems by incorporating feedback loops and mutual influences among elements. Developed as an extension of AHP, ANP models decisions through influence networks rather than strict hierarchies, allowing for inner dependencies within clusters and outer dependencies between them.^[4] This framework derives ratio-scale priorities from relative measurements of interactions with respect to control criteria.^[1] The primary purpose of ANP is to support multi-criteria decision-making by ranking alternatives, prioritizing criteria, and synthesizing expert judgments in environments involving intangible factors and interdependencies. It enables the evaluation of options in dynamic scenarios, such as business strategy or policy formulation, where elements influence each other reciprocally.^[4] By capturing these complexities, ANP provides a structured approach to trade off benefits, costs, opportunities, and risks.^[1] Key terminology in ANP includes the decision goal, which specifies the overarching objective; criteria and sub-criteria, which form the control hierarchy or network guiding interactions; and alternatives, which represent the competing options for selection.^[1] The process yields global priorities for these elements, obtained from the limit supermatrix that reflects stabilized long-term influences.^[4]

Historical Background

The Analytic Network Process (ANP) was developed by Thomas L. Saaty in the 1990s as a generalization of the Analytic Hierarchy Process (AHP), which Saaty had introduced in the 1970s to facilitate structured decision-making under conditions assuming independence among criteria and alternatives.^[5] This extension emerged to address the limitations of AHP in scenarios involving interdependencies and feedback loops, allowing for more realistic modeling of complex systems.^[6] The foundational publication for ANP was Saaty's 1996 book, Decision Making with Dependence and Feedback: The Analytic Network Process, which provided the theoretical framework and mathematical foundations for incorporating dependencies into multi-criteria decision analysis.^[7] Building on this, Saaty's 2005 book, Theory and Applications of the Analytic Network Process: Decision Making with Benefits, Opportunities, Costs, and Risks, further evolved the method by integrating the BOCR (Benefits, Opportunities, Costs, Risks) framework in the early 2000s, enabling comprehensive evaluation of strategic alternatives across multiple dimensions.^[8] Key milestones in ANP's development include the biennial International Symposium on the Analytic Hierarchy Process (ISAHP), initiated in 1988 in Tianjin, China, which initially focused on AHP but expanded to dedicated ANP sessions following the 1996 publication, fostering ongoing research and applications.^[9] Post-2020, ANP has undergone significant expansions through hybrid models, such as integrations with fuzzy logic to manage uncertainty and with DEMATEL to delineate causal interrelationships, as evidenced in studies on organizational prioritization and supplier selection.^[10]

Relation to Analytic Hierarchy Process

Limitations of AHP

The Analytic Hierarchy Process (AHP) fundamentally assumes independence among elements within its hierarchical structure, meaning criteria are presumed not to influence one another, and alternatives are evaluated solely based on their direct performance against each criterion. This axiom simplifies decision-making but often leads to oversimplification in complex real-world scenarios where interdependencies exist, such as economic models involving mutual influences between factors like supply, demand, and market conditions. For instance, in assessing investment options, the perceived risk of one alternative may affect the evaluation of others, a feedback loop that AHP cannot capture without violating its core assumptions.^[11] AHP's reliance on linear hierarchies further restricts its ability to model loops or cycles, enforcing a top-down structure that ignores both outer dependencies (e.g., higher-level criteria influencing lower ones) and inner dependencies (e.g., mutual influences among alternatives or criteria at the same level). This results in a unidirectional flow of priorities, which fails to represent nonlinear relationships prevalent in systems like organizational strategy or environmental planning, where elements exhibit reciprocal effects. Consequently, AHP may produce priorities that do not reflect the dynamic interplay of factors, potentially leading to suboptimal decisions in interdependent contexts.^[11] Another significant limitation is the rank reversal phenomenon in AHP, where the addition or removal of an alternative can unexpectedly alter the relative rankings of the remaining alternatives, even if their inherent priorities remain unchanged. This instability arises from the normalization process in pairwise comparisons and is particularly problematic in scenarios with interdependent elements, as the method's distributive mode amplifies inconsistencies when alternatives interact. For example, in a car selection decision, where criteria like price and comfort are mutually influential—such as how budget constraints shape perceptions of comfort—AHP's hierarchical evaluation might reverse rankings upon introducing a new option, undermining the reliability of outcomes.

Advantages of ANP over AHP

The Analytic Network Process (ANP) extends the Analytic Hierarchy Process (AHP) by incorporating feedback loops and mutual influences among decision elements, allowing for more realistic modeling of nonlinear systems where criteria and alternatives interact dynamically.^[1] This capability addresses the limitations of AHP's assumption of independence, enabling ANP to represent complex real-world scenarios, such as economic or social systems, through interconnected networks rather than rigid hierarchies.^[12] A key advantage lies in ANP's use of supermatrices to quantify interdependencies, which capture the flow of influence across elements and yield stable limiting priorities after convergence, making it particularly suitable for dynamic environments where priorities may evolve.^[1] Unlike AHP, which can suffer from inconsistencies in hierarchical rankings under changing conditions, ANP's iterative supermatrix approach ensures consistent synthesis of influences, providing robust outcomes without the need for repeated recalibrations.^[12] ANP also offers greater flexibility for group decisions and the evaluation of intangible criteria by extending pairwise comparisons across network structures, facilitating the aggregation of diverse expert judgments into a unified priority vector while handling subjective factors like preferences or risks.^[12] This is achieved through a mathematically justified synthesis that preserves individual inputs without forcing consensus, allowing intangible elements—such as stakeholder satisfaction or environmental impact—to be integrated alongside quantitative measures via ratio-scale priorities derived from comparisons.^[12] For instance, in supply chain optimization, ANP models outer dependencies where supplier reliability directly influences cost assessments, enabling a comprehensive prioritization of risks like material unavailability or quality failures by accounting for their mutual effects across criteria such as impact and probability.^[13] This approach has been applied in green residential megaprojects, where interdependencies among 12 risk factors were quantified to identify top priorities, demonstrating ANP's practical value in interdependent decision contexts.^[13]

Core Concepts

Network Structure and Components

The Analytic Network Process (ANP) decomposes complex decision problems into a network structure composed of clusters and elements to capture interrelationships among factors. Clusters are logical groupings of homogeneous elements that share common characteristics or functions, such as a criteria cluster containing decision standards like quality and cost, or an alternatives cluster including specific options like product designs. Elements, in turn, are the individual nodes within these clusters, representing discrete factors such as subcriteria or actors that influence the decision. This hierarchical yet interconnected division enables the modeling of real-world problems where elements do not operate in isolation.^[14] A key feature of the ANP network is the control hierarchy, which provides an overarching framework for guiding evaluations and prioritizing strategic aspects of the decision. This hierarchy typically starts with a goal at the top and descends into clusters of control criteria and subcriteria, often utilizing the BOCR (benefits, opportunities, costs, risks) framework to assess positive and negative impacts separately. Under BOCR, benefits and opportunities form the positive merits, while costs and risks represent the negative ones, allowing decision-makers to weigh strategic priorities systematically before integrating them into the broader network.^[15] The network structure is visualized as a directed graph, with nodes denoting elements and arcs representing influences or dependencies between them. These arcs illustrate the flow of impact, including unidirectional influences from one element to another, feedback loops for reciprocal effects, and cycles that reflect ongoing interactions. Such graphical representation highlights the nonlinear nature of ANP models, distinguishing them from linear hierarchies by accommodating sources (originating influences), sinks (receiving influences), and transient paths.^[12] Dependencies in the ANP network are categorized into inner and outer types to model interactions precisely. Inner dependencies occur within a single cluster, where elements influence one another through loops, such as criteria mutually affecting each other in a benefits cluster. Outer dependencies, by contrast, exist between different clusters, enabling influences like alternatives impacting criteria or vice versa, thus capturing cross-group feedbacks essential for complex decisions. These dependencies are quantified through pairwise comparisons of influences, ensuring the structure reflects actual interrelations.^[14]

Dependencies and Influences

In the Analytic Network Process (ANP), influence refers to the relative impact that one element exerts on another within the decision model, determined through pairwise comparisons under a specific control criterion. This concept extends beyond unidirectional relationships by incorporating mutual effects, allowing for a more realistic representation of complex systems where elements interact dynamically.^[1] ANP distinguishes between two primary types of dependencies to capture these interactions. Outer dependencies occur between elements in different clusters, such as when criteria in one cluster affect alternatives in another, enabling cross-level influences in the network structure. Inner dependencies, in contrast, arise within the same cluster, involving feedback loops where elements mutually reinforce or modify each other, such as sub-criteria that interdependent in their evaluation.^[1] These dependencies play a crucial role in decision synthesis by facilitating dynamic priority adjustments that account for inter-element interactions, thereby producing synthesized outcomes that reflect the nonlinear nature of real-world feedback rather than static hierarchies.^[16]

The ANP Process

Model Construction and Pairwise Comparisons

The model construction phase of the Analytic Network Process (ANP) initiates with the decomposition of the decision problem into a network structure comprising clusters and elements. This step typically employs brainstorming sessions, expert consultations, or systematic analysis to identify relevant clusters—such as goal, criteria, subcriteria, actors, and alternatives—and the specific elements within each cluster. Influences and dependencies are then mapped as directed links between elements, representing outer dependencies (across clusters) and inner dependencies (within clusters), thereby capturing the interconnected nature of the problem. For instance, in a strategic planning scenario, clusters might include market factors and operational strategies, with elements like "customer preferences" linked to "supply chain efficiency" to denote mutual influences.^[6] Once the network is structured, pairwise comparisons are performed to elicit judgments on the relative importance or influence of elements. Decision-makers use Saaty's fundamental scale, ranging from 1 (equal importance) to 9 (extreme importance), with intermediate values (3 for moderate, 5 for strong, 7 for very strong) and reciprocal entries for the inverse comparisons, to assess questions such as "To what degree does element A contribute more to the objective than element B?" These judgments populate reciprocal matrices for each set of comparisons, such as influences from one cluster to another or within a cluster. The principal right eigenvector of each matrix yields the local priority vector, quantifying the relative weights of the elements involved.^[6]^[17] To validate the judgments, inconsistencies in the pairwise comparison matrices are evaluated using the consistency ratio (CR). The CR is calculated as

CR = \frac{\lambda_{\max} - n}{(n-1) \cdot RI},

where \lambda_{\max} is the principal eigenvalue of the matrix, n is the matrix order (number of elements compared), and RI is the average random index for that size (e.g., 0.90 for n=4, 1.12 for n=7). A CR below 0.10 indicates acceptable consistency, reflecting human judgment tolerances; values exceeding this threshold prompt revision of the comparisons to improve reliability.^[6]^[17] The outcomes of these validated pairwise comparisons form the unweighted supermatrix by inserting the local priority vectors as columns, where each column corresponds to the influences exerted by a specific element on all others in the network. This matrix structure directly encodes the direct relationships derived from the judgments, serving as the foundational input for subsequent weighting and synthesis steps in ANP, without yet incorporating cluster-level priorities.^[6]

Supermatrix Development

In the Analytic Network Process (ANP), the supermatrix serves as the core mathematical structure to capture interdependencies among elements within and across clusters. The unweighted supermatrix [W](/page/W) is constructed as a partitioned matrix, where the network is divided into n clusters C_1, C_2, \dots, C_n, each containing specific elements. Each block W_{ij} in [W](/page/W) represents the local priority vector derived from pairwise comparisons of the influence of elements in cluster i on elements in cluster j, with the entries in each column of W_{ij} summing to 1 to ensure that the priorities are normalized within that block. This setup encodes the direct influences without yet accounting for the relative importance of the clusters themselves.^[1] To incorporate the hierarchical priorities of the clusters, the unweighted supermatrix W is transformed into the weighted supermatrix S by multiplying it by the cluster priority matrix C, which contains the overall priorities of the clusters obtained from higher-level comparisons. Formally, this is expressed as S = C \times W, where each block S_{ij} = c_j W_{ij} and c_j is the priority of the influenced cluster j. The resulting S is column-stochastic, meaning every column sums to 1, which normalizes the influences across the entire network and ensures the matrix represents global rather than local priorities.^[1] The limit supermatrix is obtained by raising the weighted supermatrix S to successively higher powers until it converges to a stable form, denoted \lim_{k \to \infty} S^k. This convergence yields the final global priorities for all elements, as the limiting matrix captures the long-term, synthesized effects of all interdependencies and feedback loops in the network, provided S is irreducible and primitive to guarantee a unique limit. The column-stochastic property of S is essential for this convergence, allowing the priorities to stabilize regardless of the starting influence.^[1]

Priority Derivation and Synthesis

In the Analytic Network Process (ANP), global priorities are extracted from the limit supermatrix, which captures the long-term stable influences among all elements after accounting for dependencies and feedbacks. The limit supermatrix is formed by raising the weighted supermatrix to successively higher powers until convergence occurs, at which point each column contains identical priority values representing the overall relative influence of the elements.^[18] These global priorities, given by the entries in the columns of the limit supermatrix (which are identical), indicate the synthesized impact of each network element, including alternatives, criteria, and other components, normalized to sum to one across relevant clusters.^[1] To obtain decision outcomes, priorities for alternatives are synthesized in either the distributive mode or the ideal mode. In the distributive mode, applicable when alternatives exhibit mutual dependence, the local priorities of each alternative under the criteria are weighted by the global priorities of those criteria and summed, with the resulting alternative priorities normalized to sum to unity:

p_i = \sum_{j} w_j \cdot l_{ij}, \quad \sum_i p_i = 1

where p_i is the global priority of alternative i, w_j is the global priority of criterion j, and l_{ij} is the local priority of alternative i with respect to criterion j.^[18] In the ideal mode, used to preserve absolute performance rankings especially for independent alternatives, local priorities are first normalized by dividing each by the maximum value in its criterion column, then synthesized via the same weighted summation without final normalization across alternatives.^[18] Sensitivity analysis evaluates the robustness of these synthesized priorities by systematically varying input judgments, such as altering a pairwise comparison ratio by 10% or more, and recomputing the limit supermatrix to observe shifts in alternative rankings and priority values. This process identifies critical judgments whose small changes lead to significant outcome variations, ensuring the decision's stability under uncertainty.^[18] The final ranking orders alternatives by their synthesized global priorities in descending order, with the highest priority indicating the most desirable option; when incorporating group judgments aggregated via geometric means, confidence intervals can be computed from the variance of individual priority estimates to quantify decision reliability.^[18]^[19]

Applications

Diverse Fields of Use

The Analytic Network Process (ANP) has demonstrated versatility across engineering domains, particularly in risk assessment for complex projects. In construction and real estate development, ANP facilitates the evaluation of interdependent risks such as financial uncertainties, regulatory changes, and environmental factors by modeling network structures that capture mutual influences among criteria. For instance, it has been applied to prioritize risks in commercial real estate projects, enabling stakeholders to derive weighted priorities for mitigation strategies through supermatrix synthesis. Similarly, in mega-construction initiatives, ANP quantifies overall project risks by integrating expert judgments on interlinked elements like technical feasibility and stakeholder impacts, providing a structured framework superior to independent criterion analyses. In healthcare, ANP supports resource allocation decisions amid crises, accounting for dependencies between medical needs, supply availability, and policy constraints. It has been utilized to prioritize allocation indicators for scarce pharmaceuticals across provinces, incorporating criteria such as equity (e.g., bed occupancy rate), efficiency (e.g., population), and effectiveness (e.g., disease burden) to optimize outcomes. This approach enhances decision-making by synthesizing priorities from pairwise comparisons, ensuring that allocation strategies reflect real-world feedback loops in healthcare systems.^[20] ANP's application in finance emphasizes investment prioritization under uncertainty, where it models interactions among economic indicators, market risks, and behavioral factors. It aids in selecting portfolios by weighting alternatives based on interdependent criteria like return volatility, regulatory compliance, and macroeconomic influences, often outperforming linear models in capturing holistic financial dynamics. Recent studies highlight its role in behavioral finance contexts, where ANP integrates psychological biases into priority derivation for more robust investment decisions.^[21]^[22] Within supply chain management, ANP excels in supplier selection by addressing interdependencies among evaluation criteria such as cost, quality, delivery reliability, and sustainability. It constructs network models to assess suppliers holistically, using supermatrices to propagate influences and derive global priorities, which is particularly valuable in global chains with feedback effects. Case applications in electronics manufacturing demonstrate how ANP refines selection processes, balancing short-term metrics with long-term partnership viability.^[23] In the energy sector, ANP informs renewable site selection by evaluating multifaceted criteria including geographical suitability, environmental impact, and economic viability, while accounting for outer dependencies like policy changes. For biomass refineries and nuclear facilities, it prioritizes locations through integrated assessments of technical, social, and ecological factors, yielding optimized decisions that support sustainable energy transitions. This method's strength lies in its ability to handle non-linear relationships, such as trade-offs between land use and energy output. Recent applications include nuclear power plant location and reactor type selection (as of 2024).^[24]^[25] Environmental management leverages ANP for sustainability planning, where it assesses interlinked dimensions of ecological, social, and economic impacts in projects like urban transformations. By modeling networks of criteria such as resource depletion and community welfare, ANP derives priorities for initiatives aligning with long-term environmental goals, as seen in evaluations of coastal land use and risk-integrated sustainability strategies. Its application promotes balanced planning by quantifying influences across sustainability pillars. Recent uses include sub-watershed prioritization for degradation assessment in Mexico (as of 2024).^[26]^[27]^[28] Hybrid extensions of ANP enhance its applicability in uncertain environments; for example, integration with fuzzy sets (fuzzy ANP) addresses vagueness in judgments, commonly used in supplier selection to incorporate imprecise data on criteria like performance reliability. Similarly, combining ANP with TOPSIS for ranking alternatives has been employed in supply chain sustainability evaluations, where ANP weights interdependent criteria and TOPSIS orders options based on ideal solutions, improving precision in complex rankings. These hybrids expand ANP's utility by mitigating limitations in handling ambiguity and multi-attribute synthesis.^[29]^[30] Post-2020, ANP adoption has continued in sustainable development and public policy, driven by global challenges like climate action and equitable resource distribution. This trend reflects ANP's alignment with interdependent policy networks, facilitating decisions in areas such as green infrastructure and pandemic recovery planning.

Notable Case Studies

One notable application of the Analytic Network Process (ANP) is in determining the appropriate governance model for green port management, as explored by Munim et al. in 2020. The study constructed a network incorporating environmental and economic criteria, such as internal environmental management, sustainable operations, environmental pricing, green technology, and supply chain collaboration, across four governance models: service ports, tool ports, landlord ports, and private service ports. Interdependencies, including feedback loops between cost and risk factors, were modeled, revealing that these relationships shifted priorities away from full privatization toward the landlord model, which balances private innovation with public oversight to enhance green practices. This approach was applied to ports in the Indian Ocean Rim, including those in Tanzania, Sri Lanka, and Bangladesh, recommending the landlord model to mitigate monopolistic risks while promoting environmental and economic sustainability.^[31] In supplier selection for manufacturing, ANP has been effectively used to account for interdependencies among criteria clusters like quality systems and delivery performance, as demonstrated in a case study of an electronic firm by Gencer and Gürpınar in 2007—a seminal example influencing later applications. The model included three main clusters: business structure (e.g., financial status), manufacturing capability (e.g., delivery appropriateness and machine capacity), and quality system (e.g., process control and quality manual), with 45 sub-criteria overall. The supermatrix captured hidden influences, such as how quality interdependencies affected delivery priorities, leading to the selection of the highest-priority supplier through limiting supermatrix synthesis and improving supply chain decision accuracy in interdependent environments. Subsequent studies, including those in sustainable manufacturing around 2022, have built on this framework to reveal similar influences, resulting in efficiency gains through better-aligned supplier choices.^[23] These case studies highlight ANP's practical impact, with quantifiable benefits including enhanced decision accuracy—such as shifted governance priorities in port models—and improved outcomes in complex, interdependent scenarios like supply chains and public health crises.^[31]

Tools and Implementation

Available Software

Several software tools are available for implementing the Analytic Network Process (ANP), ranging from dedicated applications to open-source libraries that facilitate model construction, pairwise comparisons, supermatrix computation, and priority derivation. These tools vary in accessibility, with free options dominating the landscape for both practitioners and researchers.^[32] The most widely used dedicated software is SuperDecisions, developed by the Creative Decision Foundation. This free application, available for Windows and macOS after registration, supports the full ANP workflow, including building network models with clusters and nodes, entering pairwise comparison judgments, synthesizing unweighted and weighted supermatrices, deriving priorities, and conducting sensitivity analysis to assess result robustness. Its version 3.2 features an updated interface for streamlined model management, making it suitable for handling interdependencies in complex decision scenarios.^[32]^[33] Another specialized tool is ANSPI, a JavaScript-based application designed for ANP prioritization in complex problems. It offers an intuitive interface for defining multiple criteria, alternatives, and networked structures, enabling users to perform pairwise comparisons and compute priorities while visualizing influence relationships. Developed for accessibility in decision-making contexts, ANSPI is particularly effective for large networks but may require familiarity with ANP concepts for optimal use, positioning it as a more targeted option for experienced analysts rather than beginners.^[34] For users preferring programmable environments, open-source Python libraries provide flexible alternatives for custom ANP implementations. The pyanp library, installable via pip, supports AHP and ANP calculations, including matrix construction and eigenvector derivation, aiding researchers in extending models or integrating ANP with other data analysis pipelines. Similarly, AhpAnpLib, released in early 2025, assists in structuring hierarchical and network models, performing consistency checks on judgments, and generating priority vectors, with an emphasis on ease of integration into scripts for automated workflows. These libraries prioritize advanced features like scripting and scalability over graphical interfaces, appealing to computational researchers.^[35]^[36] Integrated tools such as Excel add-ins or MATLAB functions allow for bespoke supermatrix calculations in familiar environments, though they typically require manual setup of pairwise comparison matrices and eigenvalue computations. For non-experts, SuperDecisions stands out for its user-friendly graphical tools and comprehensive tutorials, whereas advanced users may favor Python libraries for their extensibility and integration with broader analytical ecosystems. Selection often balances ease of adoption—favoring intuitive software like SuperDecisions—for practical applications against the customization potential of open-source options for research-oriented tasks.^[37]

Computational Considerations

The Analytic Network Process (ANP) encounters substantial scalability challenges in large-scale applications, primarily due to the quadratic growth in the number of pairwise comparisons required. For a single cluster containing n elements, the process demands n(n-1)/2 judgments, and ANP's incorporation of bidirectional interdependencies between clusters nearly doubles this count relative to the Analytic Hierarchy Process (AHP). This exponential increase in data elicitation and processing can render manual or simple computational approaches impractical for networks exceeding dozens of elements. To mitigate these issues, practitioners often employ group elicitation techniques, aggregating judgments from multiple experts to distribute the workload, or approximations such as sorting-based methods that reduce the total comparisons while preserving priority accuracy.^[38]^[39]^[40] Convergence of the supermatrix to a stable limit matrix is another critical computational hurdle in ANP, necessitating that the weighted supermatrix be column-stochastic—each column summing to unity—for the powers of the matrix to yield identical columns representing final priorities. Failure to achieve stochasticity, often arising from unnormalized local priorities in the unweighted supermatrix, can result in non-convergent behavior or cycling priorities that undermine result stability. Solutions typically involve iterative normalization of columns during supermatrix construction, ensuring convergence through repeated matrix exponentiation until stabilization, as implemented in dedicated tools.^[41]^[42] Key error sources in ANP computations include judgment inconsistency within pairwise comparison matrices and numerical rounding during matrix operations in software. Inconsistency is quantified via the Consistency Ratio (CR), computed as \text{CR} = \frac{\lambda_{\max} - n}{(n-1) \cdot \text{RI}}, where \lambda_{\max} is the principal eigenvalue, n is the matrix order, and RI is the random index (e.g., 0.90 for n=8); a CR below 0.10 signifies acceptable consistency, prompting revision of inconsistent judgments otherwise. Rounding errors, particularly in floating-point representations of large supermatrices, can propagate during exponentiation, amplifying discrepancies in priorities. To validate model robustness against these errors, Monte Carlo simulations are recommended, simulating random variations in judgments to assess priority sensitivity and confidence intervals.^[43]^[44] For ANP models involving 50 or more elements, resource demands surpass the capabilities of basic spreadsheets, as supermatrix exponentiation to high powers (often hundreds) requires substantial memory and processing time for matrix multiplications. Such computations favor specialized software that optimizes linear algebra operations and handles sparse matrices efficiently, enabling practical implementation for complex networks.^[42]^[45]

Limitations and Criticisms

Methodological Shortcomings

The Analytic Network Process (ANP) heavily depends on pairwise comparisons derived from expert judgments, which introduces significant subjectivity and potential bias into the decision-making framework. These judgments are elicited using a fundamental scale ranging from 1 to 9 to express relative importance or preference, but this process lacks built-in statistical validation mechanisms, such as hypothesis testing, to objectively verify the reliability of the inputs. As a result, inconsistencies arising from cognitive limitations or personal biases can propagate through the model without robust correction beyond basic consistency ratios.^[46] For larger models involving numerous elements and interdependencies, ANP imposes a high cognitive load on decision-makers, often requiring hundreds of pairwise comparisons to construct the supermatrix, which can be time-consuming and prone to fatigue-induced errors. While consistency checks can help mitigate some inconsistencies in judgments, they do not fully address the scalability challenges in extensive applications.^[46]^[47] Rank instability represents another methodological weakness in ANP, where small changes in inputs—such as the addition or removal of alternatives—can lead to reversal in the priority rankings of options, a phenomenon inherited from the Analytic Hierarchy Process (AHP) but amplified by ANP's feedback loops and nonlinear dynamics. This issue arises particularly in feedback scenarios, undermining the stability and reliability of derived priorities, and the method does not provide absolute measurements of efficiency, relying instead on relative ratios that may not reflect true performance scales.^[48]^[47] Additionally, ANP faces challenges in accurately quantifying intangible factors, such as social or environmental impacts, due to the inherent difficulties in translating qualitative assessments into precise numerical values via the linear 1-9 scale, which may not capture the nonlinear nature of real-world phenomena. Measurement errors from these subjective quantifications can further distort outcomes, limiting the method's precision in handling diverse, non-monetary criteria.^[46]

Alternative Methods Comparison

The Analytic Network Process (ANP) excels in capturing interdependencies among decision elements, making it suitable for complex multi-criteria decision-making (MCDM) scenarios, but it contrasts with methods like TOPSIS and VIKOR, which prioritize simplicity in ranking alternatives based on geometric distances or compromise solutions under assumptions of criterion independence.^[49] TOPSIS, for instance, measures the closeness of alternatives to ideal solutions using Euclidean distances, offering computational efficiency for problems with independent criteria but failing to account for feedback loops that ANP models via supermatrices.^[50] Similarly, VIKOR focuses on balancing maximum group utility and minimum individual regret to derive compromise rankings, proving effective in straightforward prioritization tasks yet requiring supplementary weighting methods like ANP when interrelations are present.^[49] While ANP's network structure provides deeper insight into influences, TOPSIS and VIKOR are preferable for their reduced complexity and faster execution in scenarios lacking significant dependencies.^[51] In comparison to DEMATEL, ANP quantifies element priorities through pairwise comparisons and synthesis, whereas DEMATEL emphasizes mapping causal relationships and influence levels among factors without deriving final weights.^[52] DEMATEL constructs directed graphs to visualize cause-effect dynamics, aiding in structural analysis, but it does not prioritize alternatives as comprehensively as ANP's supermatrix approach.^[53] Hybrids integrating both, such as DEMATEL-ANP, enhance decision accuracy by first identifying interrelations with DEMATEL and then weighting them via ANP, reducing error probabilities from overlooked feedbacks compared to standalone ANP.^[52] Thus, DEMATEL complements ANP in exploratory phases but stands alone for pure influence modeling where priority derivation is secondary.^[53] ANP extends the hierarchical framework of AHP to networks, inherently addressing interdependencies, but fuzzy variants of AHP (Fuzzy AHP) introduce triangular fuzzy numbers to better handle linguistic uncertainty in judgments, filling gaps in standard ANP where vagueness is not explicitly modeled.^[54] Fuzzy AHP applies fuzzy logarithmic preference programming to consistent priority derivation under uncertainty, maintaining simplicity for hierarchical problems, whereas ANP's fuzzy extensions require additional supermatrix adjustments for network complexities.^[55] Although ANP provides a more holistic view of dependencies, Fuzzy AHP is often favored when uncertainty dominates but network effects are minimal, avoiding the increased computational burden of fuzzy ANP.^[54] Alternatives to ANP are selected based on problem characteristics: for small-scale decisions with independent criteria, AHP suffices due to its streamlined hierarchical structure and lower data requirements, avoiding ANP's extensive comparisons.^[56] Conversely, DEMATEL is ideal for causal modeling without the need for priority quantification, focusing solely on relational impacts in exploratory analyses.^[52] TOPSIS or VIKOR may be chosen for rapid alternative ranking in independence-assumed contexts, while Fuzzy AHP suits uncertain hierarchical evaluations lacking strong feedbacks.^[49]

Research Developments

Key Literature

The foundational work on the Analytic Network Process (ANP) was introduced by Thomas L. Saaty in his 1996 book, Decision Making with Dependence and Feedback: The Analytic Network Process, which formalized the methodology to handle complex decision problems involving interdependencies and feedback loops among elements.^[57] This text established the core supermatrix approach for synthesizing priorities in networks, extending the earlier Analytic Hierarchy Process to non-hierarchical structures.^[58] Building on this, Saaty's 2005 book, Theory and Applications of the Analytic Network Process: Decision Making with Benefits, Opportunities, Costs, and Risks, provided a comprehensive framework for applying ANP in strategic decision-making, particularly through the BOCR (benefits, opportunities, costs, risks) merit analysis.^[8] The volume detailed the use of supermatrices to capture influences across strategic criteria, enabling leaders to balance intangible factors in multifaceted scenarios.^[59] Methodologically, Saaty's 2004 paper, "Fundamentals of the Analytic Network Process—Multiple Networks with Benefits, Costs, Opportunities and Risks," advanced the theory by outlining how to construct and raise supermatrices for multiple interdependent networks, incorporating BOCR to prioritize alternatives under uncertainty.^[15] A more recent methodological review by Taherdoost and Madanchian (2023) synthesizes ANP's evolution, highlighting its applications in diverse fields while critiquing limitations such as subjective judgment aggregation and computational intensity in large networks.^[60] In applied contexts, Munim et al. (2020) demonstrated ANP's utility in port management by integrating it with the Best-Worst Method to evaluate governance models for green port initiatives across the Indian Ocean Rim, revealing the tool's effectiveness in assessing sustainability trade-offs.^[31] Hybrid ANP models, combining it with techniques like fuzzy logic or data envelopment analysis, have proliferated since 2015, with extensive citations underscoring their impact in enhancing robustness for real-world problems.^[61] ANP literature is accessible through seminal books from RWS Publications and journal articles in high-impact outlets such as Omega and the European Journal of Operational Research, which have hosted key advancements in ANP modeling and validation.^[62] Since 2020, open-access publications have increased, including reviews and applications in journals like the International Journal of the Analytic Hierarchy Process, broadening dissemination of ANP methodologies.^[63] Symposia proceedings have further enriched this body of work.

Ongoing Community and Symposia

The International Symposium on the Analytic Hierarchy Process (ISAHP) serves as a primary biennial forum for the ANP community, having convened since its inaugural event in 1988 in Tianjin, China. Organized by the Creative Decision Foundation, the symposium has included dedicated sessions on the Analytic Network Process (ANP) since the late 1990s, reflecting the method's evolution as an extension of the Analytic Hierarchy Process (AHP).^[64] The 2024 edition, held virtually from December 13 to 15, emphasized AI integrations with AHP and ANP, exploring theoretical advancements and practical applications in decision-making.^[65] The Creative Decision Foundation plays a central role in fostering the ANP research community, sponsoring education, software development, and events to promote rational decision-making through AHP and ANP methodologies.^[66] Active groups within operations research societies, such as the INFORMS community, integrate ANP into multi-criteria decision analysis, contributing to its application in complex systems.^[67] Bibliometric analyses indicate steady growth in ANP publications, with increasing numbers in recent years, underscoring sustained scholarly engagement. Interdisciplinary collaborations in sustainability and AI-multi-criteria decision-making (MCDM) hybrids further strengthen the ANP network, often through forums like the International Journal of the Analytic Hierarchy Process and specialized workshops.^[63] These efforts address challenges in areas such as circular economy assessments, where ANP combines with AI techniques for enhanced prioritization.^[68] Online platforms, including ResearchGate, facilitate discussions among researchers, with dedicated topics enabling knowledge exchange on ANP implementations and extensions.^[69] Recent trends from 2023 to 2025 highlight future directions in ANP, particularly integrations of machine learning and AI with AHP and ANP, including explorations of generative AI for decision support.^[70]^[71] This focus aims to improve scalability and accuracy in complex decision environments, with ongoing symposia prioritizing such innovations.^[72]

References

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[PDF] Analytic Network Process (ANP) Method: A Comprehensive Review ...
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Saaty, Thomas L. - INFORMS.org
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[PDF] The Analytic Network Process
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Super Decisions | Homepage
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wjladams/pyanp: Python ANP Module and Resources - GitHub
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[PDF] Prioritization of Large dataset of Requirements with ANP ... - isahp
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[PDF] copyright isahp 2024 proceedings
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Creative Decisions Foundation | Changing the Way We Measure ...
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[69]
Upcoming Conferences of Interest to the AHP/ANP Community
Feb 6, 2023 · Second, the INFORMS Annual Conference will be held in Phoenix, Arizona, USA, October 15-18, 2023. Phoenix is a popular location with INFORMS ...
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Analytic network process: Academic insights and perspectives ...
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An innovative MCDM model fusing Delphi, Analytical Network Process (ANP), and Comprehensive Distance Based Ranking (COBRA) procedure was created to address ...
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isahp
The premier global event for Analytic Hierarchy Process (AHP) & Analytic Network Process (ANP) enthusiasts. Join us to explore the latest research, ...Missing: history | Show results with:history