Explanation
According to the Agile Practice Guide, kanban is an agile framework that uses a visual board to display the flow of work and limit the amount of work in progress (WIP) at each stage of the process. The WIP limit is a key element of kanban, as it helps to optimize the throughput and efficiency of the team, and to identify and resolve any bottlenecks or impediments. The agile project manager should change the WIP limit to reflect the team's capacity, based on the data from the kanban board and the burndown chart. This will help the team to focus on completing the most important tasks, reduce multitasking and waste, and improve the quality and delivery of the work. Changing the WIP limit is also consistent with the agile principle of responding to change over following a plan, as it allows the team to adapt to the current situation and customer needs.
References:
Agile Practice Guide, Chapter 5: Implementing Agile: Creating an Agile Environment, pp. 77-97.
PMBOK Guide, Sixth Edition, Chapter 6: Project Schedule Management, pp. 215-264.
PMP Exam Prep Coursebook, Chapter 6: Project Schedule Management, pp. 6-1 - 6-22.