Once again Ackoff provides great ideas:
Page 4 and 5 explore the method to effectively learn from decisions the organization makes. The idea seem simple but they are powerful.
The justification for the decision including its expected effects and the time by which they are expected…
The assumptions on which the expectations are based…
The information, knowledge, and understanding that went into the decision.
Who made the decision, how it was made, and when…
The decision should be monitored to determine whether the expectations are being met and the assumptions on which they are based remain valid.
When a deviation is found in either the assumptions or expectations, it should be diagnosed, the cause determined and corrective action prescribed and taken.
The corrective action is itself the result of a decision. A record of this decision should be made and treated as the original decision. In this way the process can not only yield learning but also learning how to learn.
A record of the entire process (all four steps) should be made and stored for easy access by those who may later be confronted by the need to make a similar type of decision.