Leadership, teams & operations · law 092
Brooks's Law
By Shivam Bhandari · Reviewed 31 October 2026 · How we write
what it means
Adding people to a late project makes it later.
How Brooks's Law works
New people need training from existing team members, and every extra person adds communication paths. In the short run, adding people slows a struggling project rather than speeding it up.
The principle applies far beyond software: any complex, interdependent work suffers when headcount is thrown at a deadline.
where it comes from
Fred Brooks, who managed IBM's OS/360 software project, stated it in his 1975 book The Mythical Man-Month.
Brooks's Law examples in business
Software
A late app gets five new developers and slips another month as seniors stop to onboard them.
Events
Adding volunteers the day before an event causes confusion rather than help.
Construction
Extra crews on a site get in each other's way without careful planning.
How to apply it
- 1When a project is late, first cut scope or extend the deadline.
- 2Add people early, not late, in projects.
- 3Give new people tasks that are easy to separate.
- 4Keep teams small and clearly divided.
common misreading
It isn't absolute — adding people to easily divided tasks can help. The cost comes from training and coordination.
ask yourself
Before adding people to your late project, what scope could you cut instead?
Frequently asked questions
What is Brooks's Law?
Adding people to a late project makes it later. New people need training from existing team members, and every extra person adds communication paths. In the short run, adding people slows a struggling project rather than speeding it up.
Who came up with Brooks's Law?
Fred Brooks, who managed IBM's OS/360 software project, stated it in his 1975 book The Mythical Man-Month.
How do you apply Brooks's Law in business?
1. When a project is late, first cut scope or extend the deadline. 2. Add people early, not late, in projects. 3. Give new people tasks that are easy to separate. 4. Keep teams small and clearly divided.
What is a common misunderstanding of Brooks's Law?
It isn't absolute — adding people to easily divided tasks can help. The cost comes from training and coordination.