Model: Brooks law - adding manpower to a late software project makes it later

Model: Brooks law

adding new people to a project doesn't immediately increase its capacity
in fact, it quite possibly reduces capacity during an initial stage

ramp-up period necessary to bring people up to speed, communication lines inside the team also increase significantly with every new member. emotional adaptation required both from new and old team member (the storming stage of Model: Tuckman’s Performance Model - forming, storming, norming, performing