This year, Faruk performed well on many difficult projects. His manager awarded him the highest performance rating available. When Faruk discovers that coworker Sharon, who had a normal year, received the same rating from her manager, he is upset. This situation exemplifies which of these reasons why performance appraisals can fail? overemphasis on uncharacteristic performance inadequate preparation on the part of the manager manager rating employee's personality rather than performance inconsistent ratings among supervisors or other raters