This method, developed by the US Army, will help you to understand how you have been able to achieve your goals and to reflect on how you can improve your plan of action.
Outline
After a significant period of work, compare what has happened with the objectives set and draw conclusions for the way forward.
If the evaluation is carried out in a team, it is preferable to divide the process into two stages: first, each member of the team answers the questions individually, followed by a joint discussion.
Source: Metodes.lv
Further Reading
BetterEvaluation provides tips and examples for using this method.