A collaboration tool is software or an online service that enables individuals and teams to communicate, share resources, and coordinate tasks, often supporting remote or distributed work through features such as messaging, file sharing, video conferencing, and project management.[1] These tools aim to align participants toward common goals by centralizing information and streamlining workflows, regardless of physical location.[1]The evolution of collaboration tools began in the 1960s, when computing pioneer Douglas Engelbart envisioned systems for "parallel communications" to facilitate shared information exchange among users.[2] In the 1980s, the emergence of computer networks enabled early remote collaboration concepts, including academic explorations of "computer-supported cooperative work" and "groupware."[2] The 1990s marked practical advancements with the commercialization of the internet and high-speed networking, leading to commercial products like Lotus Notes from IBM and GroupWise from Novell.[2] By the 2000s, cloud computing and mobile technologies drove further integration, with modern platforms such as Microsoft Teams—which reached 20 million daily active users by 2019 and grew to 320 million monthly active users by 2024—[3] and Slack, which had 12 million daily active users in 2019 and an estimated 42 million by 2024,[4] continuing to lead in real-time, cloud-based collaboration.[2] The COVID-19 pandemic accelerated adoption, with Teams' users surging over 800% from early 2020 to 2021, and by 2025, AI enhancements like intelligent summaries and meeting copilots are emerging trends in these platforms.[5]Key types of collaboration tools encompass communication platforms for instant messaging and voice/video calls, document synchronization tools for simultaneous editing, file sharing and cloud storage services for resource access, online whiteboards for visual brainstorming, shared calendaring for scheduling, and project management applications for task coordination.[1] These categories often overlap in integrated suites, adapting to needs like asynchronous updates or agile workflows.[6]Collaboration tools provide significant benefits, including enhanced communication efficiency, reduced miscommunication through centralized data, faster file exchanges, greater project visibility, stronger team unity, and overall productivity gains, particularly in remote or hybrid work settings spurred by shifts away from traditional offices.[1]
Fundamentals
Definition and Scope
Collaboration tools are software applications or digital platforms specifically engineered to enable multiple users to interact, share information, and complete tasks collaboratively, thereby supporting group-oriented workflows that enhance collectiveproductivity.[1] Unlike individual productivity tools, such as personal note-taking apps or solo task managers, which prioritize single-user efficiency, collaboration tools emphasize real-time or asynchronous coordination among team members to achieve shared goals.[1] This core functionality distinguishes them as essential enablers of teamwork in professional, educational, and organizational settings.[7]The scope of collaboration tools encompasses solutions for both remote and co-located teams, accommodating distributed workforces as well as in-person groups through features like shared digital spaces and synchronized editing.[8] However, this scope excludes purely entertainment-oriented applications, such as casual gaming platforms, and single-user software that lacks multi-participant interaction capabilities.[1] It includes a wide range of licensing models, from open-source and free tools to proprietaryenterprise solutions, ensuring accessibility across various organizational sizes and budgets.[9]The concept of groupware, coined in 1978 by Peter and Trudy Johnson-Lenz to describe software intentionally designed to support group processes and procedures for collective purposes, reflected early efforts to leverage computing for interpersonal coordination, evolving from foundational ideas in computer-supported cooperative work.[10][11]Effective use of collaboration tools generally requires basic prerequisites, including reliable internet access for cloud-based features or local network connectivity for on-premises deployments, ensuring seamless data synchronization and user participation.[1] These foundational elements allow tools to function across devices, from desktops to mobiles, without which core collaborative interactions may be impaired.[12]
Key Characteristics
Effective collaboration tools are characterized by several core features that enable seamless group work across diverse environments. Real-time editing allows multiple users to modify documents or projects simultaneously, minimizing delays in feedback loops and enhancing synchronicity in team efforts.[13] Version control systems track changes over time, enabling users to revert to previous iterations and maintain an audit trail of contributions, which is essential for maintaining document integrity in multi-user scenarios.[13] User permissions provide granular control over access levels, such as read-only, edit, or admin rights, ensuring that sensitive information is shared appropriately while preventing unauthorized modifications.[14] Integration with other software, including calendars, project management platforms, and cloud storage, facilitates workflow connectivity, allowing data to flow between tools without manual exports or imports.[6] Scalability supports varying team sizes, from small groups to large enterprises, by handling increased user loads and data volumes without performance degradation, often through cloud-based architectures.[15]These features deliver significant benefits, particularly in boosting organizational efficiency and creativity. Collaboration tools enhance productivity by streamlining communication and reducing reliance on traditional email, with studies indicating that advanced social technologies can cut email communication time by up to 20-30% in high-adoption organizations.[16] They improve decision-making by enabling shared insights through centralized repositories and real-time discussions, allowing teams to aggregate diverse perspectives more rapidly than siloed methods.[17] Additionally, by incorporating input from varied team members, these tools foster innovation, as evidenced by research showing that collaborative environments promote novel problem-solving and idea generation.[18]Evaluation of collaboration tools often relies on standardized metrics to assess their value and fit. Adoption rate measures the percentage of team members actively using the tool, indicating its ease of integration into daily workflows.[19] User satisfaction scores, typically gathered via surveys like Net Promoter Score (NPS), gauge perceived usability and effectiveness on a scale that correlates with long-term retention.[20]Return on investment (ROI) calculations focus on collaboration-specific outcomes, such as time saved per task—often quantified as hours reclaimed from redundant communications—allowing organizations to justify implementation costs against productivity gains.[21]Despite these advantages, key challenges persist in the characteristics of collaboration tools. Accessibility issues frequently arise for non-technical users, including complex interfaces that lack intuitive navigation or sufficient support for assistive technologies, potentially excluding less digitally proficient individuals from full participation.[22] Data privacy concerns are prominent, particularly under the General Data Protection Regulation (GDPR), adopted in 2016 and effective from May 2018, which mandates strict controls on personal data processing in shared environments, yet many tools struggle with compliance due to inadequate encryption or data residency options.[23]
Historical Development
Early Computer-Based Tools
The origins of computer-based collaboration tools trace back to the 1960s and 1970s, when timesharing systems enabled multiple users to access a single mainframe computer simultaneously through terminals, facilitating basic shared computing and message exchange among users within organizations.[24] These systems, such as those developed at MIT and other research institutions, laid the groundwork for collaborative resource use by allowing concurrent access to files and programs, though interactions were limited to text-based terminals without graphical interfaces. A pivotal advancement came in 1971 with the implementation of the first networked electronic mail on ARPANET by Ray Tomlinson at BBN, which introduced the "@" symbol and enabled message transmission between users on different computers, marking an early precursor to digital communication tools.[25][26]In the 1970s, Xerox PARC pioneered networked workstations that advanced collaborative computing concepts. The Alto personal computer, operational by 1973, connected via Ethernet—a local area networkprotocol invented at PARC in the same year—allowed users to share files, printers, and other resources across workstations, supporting team-based document editing and prototyping in an "office of the future" vision.[27] Similarly, IBM's internal developments in the late 1970s at its Poughkeepsie labs evolved into PROFS (Professional Office System) by the early 1980s, an office automation suite running on mainframes that provided electronic mail (PROFS Notes), shared calendars, and centralized document storage for collaborative workflows within large enterprises.[28] This system, later rebranded as OfficeVision in 1989, served as a precursor to integrated document-sharing platforms, emphasizing reduced reliance on paper and telephony for group coordination.[29]Milestone events in the 1980s included the introduction of shared word processing systems, such as Wang Laboratories' VS series minicomputers, launched in 1977 and expanded in the early 1980s, which integrated word processing with networked file access and basic messaging to enable document collaboration in corporate settings.[30] Concurrently, early group decision support systems (GDSS) emerged in the late 1970s and 1980s, with foundational work by researchers like Gerardine DeSanctis focusing on computer-aided tools for collective brainstorming and voting in meetings, often using mainframe-based interfaces to aggregate group inputs.[31] However, these tools faced significant limitations due to hardware constraints, such as reliance on expensive mainframes accessible primarily to large organizations, and the absence of intuitive graphical user interfaces, which confined adoption to technical experts and restricted widespread usability.[24]
Evolution Through the Digital Age
The proliferation of personal computers in the 1980s and 1990s fundamentally transformed collaboration tools from isolated, mainframe-dependent systems to accessible, networked applications that facilitated shared workflows across office environments.[32] As PCs became more affordable and powerful, they enabled the development of integrated software suites that combined individual productivity features with group-oriented functions. A seminal example was Lotus Notes, released in 1989, which introduced seamless email, calendaring, and scheduling integration within a single platform, allowing teams to coordinate tasks without relying on paper-based or centralized systems.[33] This shift marked a departure from earlier standalone tools, emphasizing real-time data sharing and reducing administrative overhead in corporate settings.[34]The advent of the internet in the 1990s accelerated this evolution by enabling web-based intranets and early voice-over-IP (VoIP) technologies, which extended collaboration beyond local networks to distributed teams.[35] Organizations rapidly adopted intranets in the mid-1990s as internal web portals for document sharing and communication, leveraging the growing infrastructure of the World Wide Web to streamline information access.[36] Concurrently, VocalTec's Internet Phone, launched in 1995, pioneered VoIP by allowing computer-to-computer voice calls over the internet, laying the groundwork for remote audio collaboration without traditional telephony costs.[37] These developments built on foundational protocols like the Simple Mail Transfer Protocol (SMTP), standardized in 1982 via RFC 821, which ensured reliable email exchange and became integral to groupware systems.[38] The growth of groupware, exemplified by Novell GroupWise—which originated from WordPerfect Office and was first released by Novell as version 4.1 in 1994, followed by versions like 5.0 in 1996—further integrated email, calendaring, and task management, supporting scalable enterprise collaboration.[39]Driving these advancements were corporate imperatives for efficiency following the 1980s recessions, particularly the 1981-1982 downturn, which prompted businesses to invest in IT to cut costs and optimize operations amid economic pressures.[40] The adoption of personal computers and early collaboration tools contributed to significant productivity gains in office environments, with labor productivity growth accelerating to around 5.7 percent annually from 1990 to 1996 in sectors leveraging these technologies.[41] Groupware implementations, such as Lotus Notes, were credited with enhancing team coordination and reducing communication delays, yielding tremendous increases in overall workplace efficiency during this period.[32]
Functional Classification
Communication Tools
Communication tools form a core component of collaboration software, enabling the exchange of messages, files, and multimedia among team members to facilitate information sharing and decision-making. These tools encompass a range of modalities, from text-based messaging to audio and video exchanges, supporting both synchronous and asynchronous interactions within distributed teams. By providing persistent records or real-time connectivity, they help bridge geographical and temporal gaps, enhancing overall team cohesion and productivity.Email serves as a foundational communication tool, offering persistent, threaded discussions that allow users to compose detailed messages, attach files, and maintain searchable archives for reference. It operates on protocols such as the Simple Mail Transfer Protocol (SMTP) for sending messages and the Internet Message Access Protocol (IMAP) for retrieving and managing them on servers, enabling reliable delivery across networks.[42][43] As of 2025, approximately 376 billion emails are sent and received daily worldwide, underscoring its ubiquity in professional communication.[44] Common use cases include daily check-ins, sharing project updates with attachments, and documenting agreements, particularly in asynchronous settings where immediate responses are not required.Instant messaging (IM) provides real-time text-based exchanges, allowing team members to engage in quick, informal conversations within dedicated channels or direct threads. Evolving from early systems like Bulletin Board Systems (BBS) in the late 1970s, which enabled asynchronous message posting over dial-up connections, IM progressed through protocols like Internet Relay Chat (IRC) in the 1980s to modern applications such as Slack and Microsoft Teams.[45] These tools support features like emojis, file sharing, and integrations for notifications, making them ideal for rapid queries and brainstorming sessions. In workplace scenarios, IM reduces email overload by handling urgent questions and fostering informal team bonding, as seen in hybrid work environments where it minimizes interruptions from phone calls.[46]Voice over Internet Protocol (VoIP) and video calls enable audio-visual exchanges, facilitating richer interactions through voice, screen sharing, and facial cues during meetings. VoIP relies on protocols like the Session Initiation Protocol (SIP) to establish, modify, and terminate multimedia sessions over IP networks.[47] Use cases span crisis response, where real-time clarification prevents misunderstandings, to virtual team huddles for aligning on priorities; for instance, 93% of executives agree that video conferencing improves team effectiveness, according to a 2017 survey. Voicemail complements this as an asynchronous audio option, allowing users to leave voice recordings that can be transcribed and shared via email or apps, ensuring follow-up without live availability.[48]These tools offer high accessibility, with low barriers to entry via web or mobile interfaces, enabling seamless integration into daily workflows and supporting global teams across time zones. However, without proper integration—such as linking calendars for scheduling—they can create information silos, where critical details remain trapped in isolated threads, complicating retrieval and collaboration.[49] Brief references to coordination tools, like shared calendars, can mitigate this by embedding scheduling directly into communication flows.
Coordination Tools
Coordination tools facilitate the organization of tasks, schedules, and resources within teams, enabling structured planning and allocation to support collaborative workflows. These tools emphasize logistical alignment, allowing members to visualize and manage shared timelines and workloads without focusing on content creation or real-time dialogue. By providing centralized platforms for tracking progress and availability, they help prevent overlaps and ensure equitable distribution of responsibilities.Core functions of coordination tools include online calendars for managing shared availability, where users can view and update schedules collectively to coordinate events and deadlines. For instance, Microsoft Outlook offers integrated calendar features for team scheduling, while Google Calendar supports real-time sharing across devices. Time-tracking software, such as Toggl, enables monitoring of billable hours and task durations to maintain accountability on project timelines. Collaborative spreadsheets like Google Sheets allow multiple users to enter and edit data simultaneously, aiding in resource planning and budget tracking through shared tables and formulas.Key features commonly found in these tools include automated reminders to notify users of impending deadlines or meetings, resource allocation mechanisms to assign team members and assets efficiently, and dependency mapping to illustrate task interdependencies for better sequencing. Additionally, API integrations enable automation by connecting coordination tools to other applications, such as linking calendar events to project management systems for seamless data flow.These tools emerged prominently in the 1990s, with Microsoft Outlook's release in 1997 marking a significant advancement in integrated email and calendar management for group coordination. Modern adoption is widespread, with a 2018 Australian survey indicating that 70% of adults rely on digital calendars for daily management, a trend that extends to professional teams where shared scheduling supports hybrid work environments.[50] Benefits include substantial reductions in scheduling conflicts. However, challenges arise from over-reliance, which can contribute to meeting fatigue as calendars become cluttered with excessive commitments. Notifications from these tools may integrate briefly with communication platforms to alert users of changes.
Cooperative Tools
Cooperative tools encompass software platforms designed to support joint creation, editing, and decision-making on shared digital content, allowing multiple users to actively contribute and refine materials in a coordinated manner. These tools foster collective input by providing interfaces for simultaneous or iterative modifications, enabling teams to build upon each other's work effectively. Unlike simpler sharing mechanisms, they incorporate mechanisms to manage contributions and maintain content integrity during collaboration.[7]Prominent examples of cooperative tools include video conferencing platforms like Zoom, which facilitate discussions and real-time feedback essential for group ideation and content refinement; wikis such as MediaWiki, which power knowledge bases through community-driven article creation and updates; and shared whiteboard applications like Miro, enabling visual brainstorming where users can draw, annotate, and iterate on ideas collectively.[51][52][53]Key features of these tools include version history to record and revert changes, concurrent editing capabilities for real-time modifications by multiple participants, and annotation tools for adding notes or highlights directly on content. Additionally, protocols like WebRTC underpin real-time media exchange, supporting seamless video streams and interactive elements in video conferencing and whiteboard sessions.[54][55]In practice, cooperative tools are applied in project brainstorming sessions using shared whiteboards to visualize concepts and in document co-authoring environments to collaboratively draft reports or plans. Their adoption has demonstrated significant efficiency gains; for instance, improved communication and collaboration via such technologies can raise the productivity of knowledge workers by 20 to 25 percent, according to McKinsey Global Institute research.[56][57]However, these tools present limitations, including intellectual property risks where shared content may blur ownership boundaries and expose sensitive ideas to unintended disclosure without proper safeguards. Concurrent editing also necessitates conflict resolution processes, such as operational transformation algorithms or manual mediation, to handle overlapping modifications and prevent data loss.[58][59]
Temporal Classification
Asynchronous Tools
Asynchronous tools facilitate collaboration where participants interact without the need for simultaneous presence, enabling time-independent exchanges that allow individuals to review, respond, and contribute at their own pace. This mode of interaction contrasts with real-time systems by decoupling user availability, often through persistent storage of messages or artifacts that can be accessed and modified asynchronously. Such tools are particularly valuable for distributed teams, as they accommodate differing schedules and time zones, fostering inclusivity in global work environments where synchronous alignment might otherwise be impractical. For instance, collaborators across continents can engage without the constraints of overlapping hours, promoting broader participation and reducing scheduling conflicts.Key examples of asynchronous tools include email, mailing lists, and newsgroups, which support threaded discussions for ongoing exchanges. Email serves as a foundational asynchronous mechanism, allowing users to compose, send, and reply to messages at convenient times, with threads preserving context for extended dialogues. Mailing lists and newsgroups extend this by enabling group-based discussions, where posts are archived and accessible for later review, facilitating community-driven collaboration on topics ranging from project updates to knowledge sharing. Workflow systems, such as those modeled in Business Process Model and Notation (BPMN), exemplify structured asynchronous coordination; for example, approval chains in BPMN diagrams route documents sequentially through approvers, who can act independently without real-time oversight. Hypertext systems, like the early World Wide Web, further illustrate this through linked documents that users navigate and annotate asynchronously, enabling collaborative knowledge building via interconnected resources.Technically, asynchronous tools rely on persistent storage models to maintain interaction history and state, often using databases to ensure durability and accessibility. Relational databases, for instance, underpin many workflow systems by storing process states, user actions, and metadata, allowing resumption of activities regardless of timing. Seminal work in this area, such as the Bayou system, demonstrated how replicated databases enable mobile and disconnected asynchronous collaboration by supporting conflict resolution and eventual consistency. Usage statistics highlight the prevalence of these tools: as of 2023, a report indicated that 47% of employers had trained teams in mixed real-time and asynchronous communication methods, reflecting their integration into hybrid workflows.[60] Another survey as of 2022 found that asynchronous approaches account for a significant share of remote interactions, with 42% of employees viewing them as the future of work.[61]The advantages of asynchronous tools include reduced interpersonal pressure, which encourages more thoughtful and detailed contributions, as well as enhanced flexibility for work-life balance. They enable higher-quality outputs by giving users time to deliberate, particularly beneficial in complex decision-making scenarios. However, drawbacks encompass delayed feedback loops, which can prolong resolution times and risk miscommunication if context is lost in extended threads. Despite these challenges, asynchronous tools remain essential for scalable, inclusive collaboration in diverse settings.
Synchronous Tools
Synchronous collaboration tools facilitate real-time interaction among multiple users, enabling live synchronization of actions and low-latency communication to support immediate feedback and joint decision-making. These tools are particularly suited for scenarios requiring concurrent participation, such as brainstorming sessions or crisis response, where participants engage simultaneously regardless of location. Unlike asynchronous methods, they emphasize presence and instant responsiveness to foster dynamic group dynamics.[62][63][64]Shared whiteboards exemplify synchronous tools by allowing users to draw, annotate, and manipulate visual elements in real time. Platforms like Miro provide infinite canvases for collaborative diagramming, where changes by one user appear instantly for all, supporting activities such as ideation and prototyping. Real-time chat systems, evolving from early protocols like IRC, offer another core example; modern successors such as Slack and Discord enable threaded messaging, emoji reactions, and voice channels for fluid, ongoing conversations among teams.[65][66][67][68]Video conferencing systems extend beyond basic Voice over IP (VoIP) to immersive experiences, integrating high-definition feeds with screen sharing and spatial audio for more engaging interactions. Advanced implementations incorporate virtual reality (VR) for meetings in simulated environments, where avatars interact in 3D spaces to enhance presence and collaboration, as seen in platforms like MeetinVR. These tools support features like gesture recognition and shared virtual objects, transforming remote sessions into near-physical encounters.[69][70][71]Decision support systems within this category include real-time polling mechanisms that aggregate live input from participants to inform group choices. Tools like Slido and Poll Everywhere allow instant creation and voting on multiple-choice questions during meetings, displaying results dynamically to guide discussions and consensus-building. Multiplayer simulations further illustrate synchronous collaboration through interactive design games, where users co-build virtual models or scenarios; examples include cooperative management simulations that require synchronized inputs for shared outcomes, promoting teamwork in educational or professional contexts.[72][73][74][75]These tools typically demand specific technical resources, with high-definition (HD) video requiring 1.2 to 3.8 Mbps of bandwidth per participant for smooth transmission. Adoption of synchronous video tools saw a dramatic surge post-2020, exemplified by Zoom's daily meeting participants rising from 10 million in December 2019 to 300 million by April 2020, reflecting heightened demand during global remote work shifts.[76][77][78][79]
Modern Developments
Unified Communications and Integration
Unified Communications (UC) refers to the integration of multiple communication channels, including voice, video, messaging, and presence information, into a single platform to streamline enterprise interactions.[80] This approach enables seamless delivery of real-time and non-real-time communications based on user preferences and device availability.[80] The term UC was popularized by Gartner in the early 2000s as a framework for combining these technologies to enhance organizational efficiency.[81]The evolution of UC has progressed from isolated, siloed tools—such as separate email systems, phone lines, and chat applications—to comprehensive all-in-one platforms that consolidate functionalities.[82] Key milestones include the launch of Slack in August 2013, which introduced persistent team messaging with integrations, and Microsoft Teams in March 2017, which expanded to include video conferencing, file sharing, and app connectivity within the Microsoft ecosystem.[83][84] To bridge disparate tools, application programming interfaces (APIs) and automation services like Zapier facilitate cross-platform workflows, allowing data to flow automatically between collaboration apps without custom coding.[85]Adopting UC platforms offers significant benefits, particularly through features like single sign-on that minimize context-switching between applications, leading to productivity gains of up to 20% per user annually according to Forrester's analysis of Microsoft Teams implementations.[86] In enterprise settings, Cisco Webex has achieved broad adoption, with high customer satisfaction ratings (4.6 out of 5) for its integrated voice, video, and messaging capabilities, supporting hybrid workforces across industries.[87]Interoperability in UC relies on open standards such as the Extensible Messaging and Presence Protocol (XMPP), an XML-based framework for real-time messaging, presence detection, and federation across systems, as implemented in solutions like Cisco's Unified Communications Manager.[88] Despite these advancements, challenges including vendor lock-in remain prevalent, where reliance on proprietary ecosystems increases switching costs and limits integration with third-party tools, prompting industry efforts to promote multi-vendor compatibility.[89]
Emerging Trends and Technologies
The integration of artificial intelligence (AI) into collaboration tools has accelerated since 2020, enhancing productivity through features like automated summarization and transcription. For instance, Otter.ai introduced AI-generated meeting summaries in March 2022, using proprietary algorithms to outline key discussion points, action items, and highlights from recorded sessions, thereby reducing manual note-taking burdens for teams. This trend aligns with the post-COVID remote work surge, where a 2023 Gallup survey indicated that approximately 80% of U.S. workers operate in hybrid or fully remote arrangements, driving demand for AI-enhanced tools to maintain seamless communication across distributed teams.[90][91]On the global front, collaboration platforms are increasingly incorporating features to support multicultural and multilingual teams, such as real-time translation capabilities. Google Meet rolled out live translated captions in early 2022, enabling participants to view subtitles in languages like Spanish, French, and Portuguese during English-language meetings, which facilitates inclusive discussions in diverse workforces. Additionally, emerging blockchain applications are piloting secure data-sharing mechanisms; for example, a 2025 framework proposes blockchain-integrated systems for aviation big data management, ensuring tamper-proof collaboration among stakeholders while addressing trust and privacy challenges in cross-organizational environments.[92][93]Looking ahead, virtual reality (VR) and augmented reality (AR) are poised to transform immersive collaboration, with Meta's Horizon Workrooms launching in August 2021 to enable VR-based meetings where users can share screens, whiteboard ideas, and interact in virtual offices, simulating in-person dynamics for remote teams. Sustainability considerations are also gaining traction, as cloud-based collaboration tools' carbon footprints—driven by data center energy consumption—are under scrutiny; a 2025 World Economic Forum report highlights that optimizing video call intensities and shifting to asynchronous workflows can reduce emissions associated with digital collaboration by up to 50% in some scenarios.[94][95]The collaboration tools market reflects these innovations, with Statista projecting steady growth at a compound annual rate of 1.58% from 2025 to 2030, underscoring the sector's expansion amid AI and remote work adoption. However, ethical challenges persist, particularly AI bias in decision-making tools, where algorithms trained on skewed datasets can perpetuate discrimination in team recommendations or resource allocation, as noted in a 2020 Harvard analysis emphasizing the need for bias audits to ensure equitable outcomes.[96][97]