How can a project manager be sure that he or she has chosen the correct metrics to assess project performance?

Question

I need to come up with three examples. Thank You..

Answer 1

1--the measure is something that can actually be moved (you'd be surprised how many won't "move" appreciably).
2--It should combine outcome and process measures, but the process measures should be those that indicate a positive outcome, not just random measures
3--depending on the project, should measure both transactional and systemic actions (people errors vs problems with the overall system) so one would know where the problems are.