hold unique pieces of the puzzle that portrays a person’s job performance. Thus, rather than having raters at just one level of the organization, it is better to have each level contribute the portion it is able to evaluate most effectively. Each performance dimension should be defined precisely enough to obtain the information unique to the relevant source. Overlap with dimensions better assessed by other sources should be avoided. The appraisal system should include compatible and mutually supporting segments. Each segment should be assigned the role to which it is best suited. Performance appraisal should not be seen as simply selecting the best method. What is “best” varies with the use made of the information, the complexity of the performance appraised, and the people capable of making such judgments