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The software development process still presents serious flaws, which result in a large number of failed, or even abandoned projects. Studies on software quality emphasize that many of these issues could be eliminated, or at least mitigated, if more attention was given to the early stages of this process, such as those covered by requirements engineering. The increasing size and complexity of modern information systems require new socio-technical approaches to prevent errors in the upstream phases of the software's life cycle to minimize rework afterwards. In this paper we describe the tool support for the ProjectIT approach, which seeks to address these problems. The proposed Wiki-based tool follows the current trend of moving applications to the Web to address some of the limitations of the current desktop-based CASE tools of the ProjectIT initiative, namely to facilitate communication, cooperation, and negotiation between stakeholders during the requirements development workflow.