Behavioral expectation scales are expressed in terms with which the rater and the employee are familiar. The rater, usually the supervisor, can review the identified behavioral anchors and indicate the items the bartender needs to improve. Since these scales are"anchored" by specific behaviors within each category, the supervisor is better able to provide specific feedback to each bar tender. If the rater also collects specific incidents during the rating period, the evaluation is apt to be more accurate and more legally defensible and is likely to be a more effective counseling tool. A serious limitation is that raters look only at a limited number of performance categories, such as, in the case of a bartender, customer relations or drink mixing. And each of these categories includes only a limited number of specific behaviors. As in the critical incident method, most supervisors are reluctant to maintain records of specific incidents, and this reduces the effectiveness of this approach when it is time to counsel the employee. 
 Behavioral observation scales (BOS) use specific named behaviors as bench- marks and require the rater to report the frequency of those behaviors. The behavioral expectation scales discussed above are concerned primarily with defining poor to superior performance; BOS ask the rater to indicate the fregency