Groupthink (i.e., group members accept the solution without thinking for themselves) can lead to bad decisions.
Decision makers are interested in evaluating what-if scenarios.
Experimentation with a real system (e.g., develop a schedule, try it , and see how well it works)may result in failure.
Experimentation with a real system is possible only for one set of conditions at a time and can be disastrous.
Changes in the decision-making environment may occur continuously, leading to invalidating assumptions about situation (e.g., deliveries around holiday times may increase, requiring a different view of the problem).