under certain conditions, an incremental person when added to a project makes it take more, not less time.
takes some time for the people added to a project to become productive. Brooks calls this the “ramp up” time
new workers on the project must first become educated about the work that has preceded them; this education requires diverting resources already working on the project
Communication overhead increases as the number of people increases
tasks including many specialties in software projects are less divisible
example: while it takes one woman nine months to make one baby, “nine women can’t make a baby in one month”.
Brooks’s law only applies to projects that are already late.[6
important to determine if the project is really late, or if the schedule was originally overly optimistic.
Scheduling mistakes account for a large number of late projects