Work remaining vs day
No hire (baseline)
With new hires
Hire day
Effective daily output (with hires)
Fred Brooks's famous rule from The Mythical Man-Month says that throwing more engineers at a late project only makes it later — but the reason is a genuine dynamic, not folklore: new hires need ramp-up time and mentoring from the people already there, and every additional person adds communication links that scale roughly with team size, not project size. This simulator runs a real day-by-day burn-down of a work backlog under two scenarios — the original team left alone, and the same team with a batch of new hires added on a chosen day — so you can watch the two curves diverge and see for yourself whether a given hire helps, barely matters, or actively pushes the finish line back, instead of reading a single static cost estimate.