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This week in pm-clinic: A management puzzle

This week in the pm-clinic discussion forum:

As a break from situations, for this week here’s a PM puzzle that never fails to surface astonishing pet theories and assumptions:

Since a 100 person-day project cannot be practically completed in 1 day with 100 people, it’s safe to assume it cannot be completed in 2 days with 50 people. But the question is, assuming the total amount of work is known (e.g. 100 person days), how should you estimate how many people you need, or how much calendar time it will take?