This is a post by Cat McClintock on PTC site.
In project management, there’s an old maxim that nine women can’t make a baby in one month. Coined by Fred Brooks in his 1975 book, the Mythical Man Month, the point was that simply adding people to a project doesn’t necessarily save time. Some tasks simply can’t be divided up evenly or effectively. In fact, new talent can even delay projects as people try to get up to speed, make rookie mistakes, and add communication overhead.