A project postmortem is an activity requiring developers to reflect on the activities of the now completed project. The idea is to provide developers with the opportunity to think on what things went well, and perhaps not so well. Some authors describe postmortems as one possible avenue for improvement because identifying what needs to be fixed is certainly a preliminary stage to fixing it.
Postmortems offer just that advantage.
The activity provides the participant with the opportunity to state how things should work and to plan actions to accomplish those goals. For our purposes, postmortems are intended as learning opportunities. You are asked to write about your development activities, collect, data, set goals. All this information is collected for your use. The information is not graded in any real sense.