I think each situation has different repercussions. Failing of experiments is something that should be accounted for during planning. Excessive failure of experiments may show that the project is not as feasible as was thought and should be terminated. I think the other situations listed are slightly less predictable. We saw a similar situation in the MiniSim. A plan was created and deadlines were put in place, however the regulations for what the experiments called for were not properly taken into account. As important as it is to create realistic deadlines and enforce those deadlines, it is equally important to understand that unseen events will be sure to alter those deadlines to some degree.