Different forms of the performance management system have been implemented in many countries for some years. As in other countries, in 1999 the government of Botswana took a decision to implement a performance management system (PMS) across the entire public service including schools. The government explained the purpose for which this reform was being implemented. Using grounded theory, school heads, deputy school heads and heads of houses in twenty-two of the twenty-seven schools were interviewed about senior management team's perceptions of the implementation process in senior secondary schools in Botswana. These members of the senior management team are responsible for the implementation process of the PMS in schools. This paper looks at participants' perceptions regarding the expected benefits of the PMS in senior secondary schools.