A new PM taking over a project "mid stream" will need to get up to speed with all of the documentation, objectives, etc. If the previous PM had produced estimates that the new PM doesn't agree with, how should the new PM proceed?
- Accept the old estimates and try to work within them, or produce new estimates?
- Produce new estimates?
I see practical difficulties with 1 (especially if the estimates are too tight), and political difficulties with 2, especially if the old PM is still in the organisation. In addition, revising the estimates, especially upwards, will undoubtedly impact on the benefits case.