The success of an organisation depends to a large extent on the work performance of its employees (Stup, 2003). Armstrong and Baron (2005) base the whole ethos of performance and performance management on the assumption that if the performance levels of employees can be raised, better organisational performance will follow as a direct result. They thus consider human resource as the most valuable asset of an organisation. This is particularly true if the people required to do the core work are highly trained individuals such as surgeons and rocket engineers. The work performance of an employee is measured using appraisal interviews which are held quarterly in a year. Performance appraisal is the process of evaluating an individual employee‟s job performance as a basis for making objective personnel decisions (Koontz and Wehrich, 1990). Managers use appraisal reports to maintain and update profiles of employees in order to assess the availability of skills, interests and experiences and to identify departments with surplus or insufficient skills or employees. The reports also form the basis for rewards, identification of skills on which employees need training or even reprimands. Managers use a variety of indicators to measure the performance of their employees. Some of the indicators frequently used to measure employees‟ performance are; quantity of work, its quality, timeliness, cost-effectiveness, absenteeism and tardiness, adherence to policy and team work (Van der Merwe, 2008). For example, the number of units produced, processed or sold is a good indicator of a production or sales employee‟s performance. The quality of work performed and how fast it is done are other performance indicators. The cost of work performed is used as a measure of performance only if the employee has some degree of control over costs. Police officer can be considered to have performed their work well if they are able to effectively maintain law and order in their areas of jurisdiction, detect and prevent crime, provide security, protect life and property and support victims of crime and disorder (Republic of Kenya, 2009).