Self- and supervisor ratings of the performance effectiveness of teachers on 30 teaching and teaching-related tasks were obtained and compared to determine the potential usefulness of self-ratings. The study also compared self- and supervisor ratings to determine areas of agreement in perceived performance effectiveness of teachers and whether there was any correlation between the rating scores from the two sources. It was found that supervisor rating scores were more inflated and that supervisors tended to rate teachers globally instead of looking at specific performance tasks. However, a significant Spearman r (r=0.97) obtained from rank-ordered mean scores of the two groups showed that teachers and supervisors held similar perceptions over areas of lesser and greater performance effectiveness. Finally, Pearson correlation coefficients computed to determine the comparability of the rating scores of the two groups were statistically significant, indicating that both groups were measuring the same performance behaviours.
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