This document discusses lessons learned from project management examples that went wrong due to unclear requirements and lack of stakeholder involvement. It emphasizes the importance of defining measurable requirements, understanding industry context, involving stakeholders in decisions, and having a requirements change process. Two case studies are presented: one where the customer was heavily involved and the project went well, and another where the customer was not as engaged and disagreed with the final product. Key lessons include having the proper contract type, not defining low-level requirements or features in contracts, and documenting all requirement and design decisions for traceability. Early symptoms that a project may go wrong are also outlined.