In three-point estimation, three figures are produced initially for every distribution that is required, based on prior experience or best guesses: The first is a most likely (M)/best guess (BG) which is the average amount of work the task might take.

The second estimate is the pessimistic (P) estimate which is the amount of work the task might take if the negative factors they identified do occur.

The third estimate is the optimistic (O) estimate which is the amount of work the task might take if the positive risks they identified do occur.

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