I suggest the following steps and/or answering the following questions:
1. What is your performance philosophy all about? (Collective goals, individual excellence, long-term success, short-term wins etc.)
2. What has worked so far (or failed terribly) towards motivating people to contribute?
3. How are you currently measuring performance?
4. What are the roles of the 10 people?
5. Think about the entire performance journey - goal-setting, equipping managers to give good quality feedback, appraisal, and outcomes of the appraisal.