Question: When activity times are known with certainty, the critical path is defined as the set of activities on a path from the projects start event

When activity times are known with certainty, the critical path is defined as the set of activities on a path from the projects start event to its finish event that, if delayed, will delay the completion date of the project. Why must this definition be modified in situations where the activity times are not known with certainty? Are there dangers associated with not modifying the definition?

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