Why if there is a tendency to overestimate activity duration

\"Why, if there is a tendency to overestimate activity durations, and add safety to the end of a project, do so many projects come in behind schedule?\" Review the CCPM approach and explanations, then state, with specific examples and an explanation, which reason you have observed or believe to be the most common explanation for projects finishing late.

Solution

If there is a tendency to overestimate activity durations, and add safety to the end of a project, then according to CCPM approach, this safety margin is waste of the time, so many projects come in behind schedule. There can be several reasons for this delay