Solution:Matching the appraisal errors with their correct descriptions:A. Halo effect - I. Rater's assessment is influenced by one aspect of an employee's performance: If a rater is impressed by one positive trait (like punctuality), they might rate all aspects positively, even unrelated ones.
B. Primacy effect - IV. Rater's assessment is influenced by behaviour exhibited by the employee during the early stages: Initial impressions heavily influence the evaluator's later ratings, even if subsequent performance changes.
C. Spillover effect - II. Rater's assessment is influenced by past performance rating of an employee: Performance ratings spill over from past appraisals, leading to biased evaluations regardless of current performance.
D. Perceptual set - III. Rater's assessment is influenced by previously held beliefs about an employee: Preconceived notions about an employee (e.g., from reputation or stereotypes) affect objective assessment.
Hence, the correct matching is: A-I, B-IV, С-II, D-III.