The PMBOKGuide suggests that when a project team recognizes an underestimation of work complexity, it is essential for the project manager to engage with the team to review and adjust the project's approach. This includes reassessing the iteration's work and complexity, updating the project management plan as necessary, and ensuring that the team has a clear understanding of the revised objectives and tasks12. References: = "Protecting software development projects against underestimation" from PMI1; "Practice: Iteration Planning Meeting" from PMI2.