Performance evaluation also requires dependable performance measures, the ratings used to evaluate performance. To ิิิbe helpful, they must be easy, to use, berelible and report on the critical behaviors that determine performance. Dependable measures also allow others using the same measures applied against the same standards-to reach the same conclusions about adding to the reliability of the appraisal system. For example, a telephone company supervisor must observe each operator's
use of company procedures: staying calm, applying tariff rates for phone calls, and following company rules and regulations