In an iterative project, it's crucial that the team understands the principles of iterative development. If the team is struggling with these principles, the project manager should step in to mentor and coach the team. This approach ensures that the team develops the necessary skills and knowledge to effectively work within an iterative framework. It also fosters a learning environment where team members can continuously improve their skills and performance. References: Project Management Professional (PMP) Reference Materials source and documents: PMI - Project Management Professional (PMP), PMI - PMBOK Guide and Standards, Professional in Business Analysis Reference Materials study guide: PMI - Professional in Business Analysis

When a phase of a project takes longer than initially anticipated, it's important for the project manager to understand why this happened in order to prevent similar issues in the future1. Organizing a root cause analysis (RCA) workshop allows the project team to identify the underlying cause of the delay1. This understanding can then be used to implement corrective actions to prevent similar delays in the future1. This approach not only addresses the immediate concern of the stakeholders but also contributes to the continuous improvement of the project management process1. References: PMI

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A "tight" matrix refers to team members working in close proximity to one another. Studies have demonstrated that such a team approach facilitates concurrent engineering by having designers working next to manufacturing engineers, for example, to help ensure that the project is designed in such a manner that it is also cost-effective to manufacture.