PlanWorks is a Web resource that supports collaborative decision making in transportation planning and project development. PlanWorks is built around key decision points in long-range planning, programming, corridor planning, and environmental review. PlanWorks suggests when and how to engage cross-disciplinary partners and stakeholder groups. PlanWorks has four major components:-A troubleshooting guide describing the common decision points and opportunities for cooperation in the transportation planning and environmental review process. For each of the key decision points, PlanWorks provides policy and stakeholder questions, data needs, case studies and examples, and links to tools that can help support the decision.-Interactive assessments that enable project stakeholders to identify opportunities to work together, improve interagency cooperation, and expedite project delivery.