The project manager should review the lessons learned registers from the previous projects to identify the root causes of the failures, the best practices that worked, and the recommendations for improvement. This will help the project manager to avoid repeating the same mistakes, to apply the proven methods, and to enhance the project performance. The lessons learned registers are part of the organizational process assets that can be used as inputs for planning and executing the project12. References:
* A Guide to the Project Management Body of Knowledge (PMBOKGuide) - Sixth Edition, Chapter
4.4.3.1, page 112
* Professional in Business Analysis (PMI-PBA) Examination Content Outline, Domain II: Planning, Task 7, page 10