Sixteen secondary school health teachers evaluated their own course teaching performance. Students in each of these courses evaluated the same teacher and the results were compared. An adapted version of a teacher rating form developed by the School of Agriculture, Oregon State University, was used by all study participants. Teacher performance was measured separately in terms of nine criteria indicated on the rating scale. Data were analyzed using a two-tailed student "t" test which suggested that of the sixteen teachers tested: (a) a significant difference existed wherein the majority of teachers underrated themselves in seven evaluative criteria as compared to the average class ratings of the same criteria; and (b) a significant difference existed wherein the majority of teachers overrated themselves in two evaluative criteria as compared to the average class rating of the same criterion.