Program Evaluation and Review Technique (PERT) implementation for estimating individual tasks

Best - The shortest possible time needed to complete a task.

Average - Duration of task that is 50% probable.

Pessimistic - The longest possible duration of the task.

Confidence - How confident are you that the real duration will be in the range Best - Worst (only available with 10+ tasks).

Confidence - Variance contribution of task, you don't need to pay attention to this row (only available with 10+ tasks).