Final answer:
Statement C is incorrect because employees are evaluated on multiple performance dimensions rather than just one, as evidenced by methods like the 360-degree feedback appraisal which involves feedback from several sources.
Step-by-step explanation:
Employees are almost always evaluated on just one performance dimension. Employees are indeed evaluated against performance standards, and task performance refers to goal-directed activities under an individual's control. Moreover, task performance evaluation usually includes multiple dimensions to capture the complexity and nuance of job roles and performance. Each performance dimension can often demand specific sets of skills and knowledge.
Performance appraisals such as the 360-degree feedback appraisal involve multiple sources of feedback, including supervisors, customers, peers, and sometimes the employees themselves. This multifaceted approach demonstrates that employees are evaluated on a variety of performance dimensions rather than just one. Performance appraisals are typically conducted following a formal process that might include an annual face-to-face meeting to discuss performance and set goals. Assessments are used in decision-making for training, career development, and occasionally, disciplinary actions or termination when performance does not meet the required standards.