Answer:
Brook's law
Step-by-step explanation:
Brook's law postulates that adding manpower late to a software project increases the time of project completion rather than shorten it. This law was postulated by Fred Brooks in The Mythical Man-Month.
Adding new personnel to a project takes the attention of other personnel from the project to training new personnel. This would increase the time for project completion. This is referred to as the ramp up time
As more manpower is added to the project, communication overhead increases. this increases the time for project completion as more time would be spent on communication rather than on carrying out the project