The studies of collaboration theories and groupware systems revealed a number of success factors. For example, Applegate’s model  proposed several stimulators and inhibitors of technology transfer, such as end users’ frustration with current processes, and using reward structure to support the use of innovation. Davis’s Technology Acceptance Model (TAM)  suggests that when users are presented with a new technology, a number of factors influence their decision about how and when they will use it, notably: perceived usefulness, and perceived ease of use. Field studies of GSS found that user friendliness , positive user feedback , and cognitive cost  are all determinants of sustainable use of a groupware. Briggs  proposed several guidelines for creating effective group support systems: 1) focusing on creating solutions for mission-critical collaborative tasks; 2) designing effective collaborative processes; 3) packaging facilitation skills and reduce GSS-usage conceptual load. EasyWinWin incorporated some useful collaboration techniques  to facilitate effective group interaction. These are used in WikiWinWin as well.
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Defining requirements without satisfying success critical stakeholders often leads to expensive project failures. Enabling interdisciplinary stakeholders to rapidly and effectively collaborate in development of globally-usable software-intensive systems remains a major challenge. At USC, 32 real-client, graduate-level team projects experimented with using the wiki-based requirements negotiation support tool WikiWinWin over a two- year period. Data collected from these projects indicated project outcome is correlated with several usage aspects, including early use, amount of use, frequency of use, shaper use, and evolving of negotiation artifacts. Several changes made based on our first-year’s experience also showed improvements in cost-effectiveness. User feedback generally confirmed that using a wiki-based negotiation tool was beneficial, and that improving on wiki-tool ease of use would yield further client satisfaction in the future.