This is a documented bias in civil projects and one of the factors of why they are notoriously over schedule and over budget.
An optimism bias leads naive project managers to gauge cost and schedule on best case scenarios. Less naive managers then have to give equally optimistic projections, just to have a hope of getting funded even if they know the projections are wrong.
An optimism bias leads naive project managers to gauge cost and schedule on best case scenarios. Less naive managers then have to give equally optimistic projections, just to have a hope of getting funded even if they know the projections are wrong.
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