The needs of the individual players are not something that can be generalized. Here are 6 cases, and the motivation behind them that led to DC implementation.
1. The company put 30 people through a DC 2 years ago, and now needed a reliable system of assessing their development over this period. They needed to decide who would remain in technical positions, and who would move into people management positions.
5. The company used DC to focus specifically on successful sales people who had done all training, to help them decide whether the move to sales management would be something they would be equally successful at.