Brooks's Law and Babies

During one of our training workshops on UX Estimation, I was introduced to Brooks's Law. As a best practice, one needs to strike the right balance of scope and people on a project. This needs to be done before the project starts; not during. As Brooks stated, "Nine women can't make a baby in one month." When you consider factors such as ramp-up time and communication overhead involved for each person added, it becomes clear why you need to get the estimation right the first time.