Effort estimate
An effort estimate predicts how much work a piece of delivery will take, expressed in hours or days of effort. It is a forecast, not a commitment, and it is made when least is known about the work. Its quality depends on how much of that uncertainty survives into how it is stated.
Estimates are made at the moment of maximum ignorance, then quoted for months afterwards as though the ignorance had been resolved.
A single number hides everything useful. Three days could mean three days if nothing surprises us, or three days if the integration behaves, which is an entirely different sentence.
A range carries the information a number throws away. So does naming the assumption underneath it. Both take one extra line and save the argument that follows a miss.
What ruins estimates is treating them as promises. Once a miss becomes a failure, people pad quietly, and padded estimates stop being forecasts at all. Then nobody can plan, because every number carries an unknown amount of hidden buffer and no way to find it.
Re-estimating is the cheap habit most teams skip. An estimate made before the work started is the worst one anybody will ever have. Revisit it once the shape is clear, say what changed, and the plan gets better while there is still time to use it.
Where this shows up in PeopleMuster
PeopleMuster records actual hours against each project, which is the other half of an estimate. Comparing the two is what turns a guess into a calibrated one over time.
Questions people ask
Should estimates be in hours or days?
Match the unit to the uncertainty. Hours imply a precision most early estimates cannot support, and an estimate in hours invites a schedule built to the hour.
Who should estimate a piece of work?
The people who will do it, wherever possible. Estimates made by somebody else become targets handed down, and the person holding the work had no say in the number.
How do estimates get better?
By comparing them with actual hours, repeatedly, without punishing the misses. A team that records both and reviews them calibrates within a few months.