Retrospective metrics help project leaders assess whether the project was effectively managed and may be used to calibrate processes for generating predictive metrics.
A few retrospective schedule metrics are:
Actual durations compared to planned schedule
Number of new unplanned activities
Assessment of estimation accuracy
Performance to standard estimates for standardized project activities
Retrospective resource metrics include:
Actual budget compared to planned budget
Total project effort
Life-cycle phase effort percentages
Late project defect correction effort as a percentage of total effort
Variances in travel, communications, equipment, outsourcing, or other expense subcategories
Retrospective scope metrics ...