Pupils in ten primary school classes were taught two lessons, separated by a fortnight's interval, by ten student teachers. After each lesson both pupils and student teachers completed questionnaires concerning their performance and attitudes. Analysis of the responses suggests that the pupils' assessments of these teachers are quite reliable. Differences between the teaching performance of men and women were revealed over the 2-week interval as were a number of critical areas that contributed to the relative 'success' or 'failure' of the individual lesson.