While developing the definition for a new project, the project manager finds a similar project was recently completed. What should the project manager do first?

The correct answer is to review the lessons learned from the previous project. This is the most proactive and beneficial first step. Lessons learned provide documented insights into what went well, what didn't, and recommendations for future projects, directly informing the definition of the new project and helping avoid past mistakes. Organizing a knowledge-sharing session might be useful later, but it's not the immediate first step; you need to understand the documented lessons first. Reusing the previous project's project management plan is premature and potentially inappropriate without first understanding the differences and lessons from the prior project. Examining the previous project's issue log could be helpful, but the lessons learned log offers a more distilled and actionable summary of challenges and solutions, making it a more efficient starting point than raw issues.