Abstract
Lessons in the foods area were conducted according to the teaching system for the mastery of learning. The changes of pupils in their knowledge and understanding were observed through the course of two years. The following are the results of the observation : 1. There is a certain degree of correlation between the pre-test and the post-test. 2. The knowledge and understanding became established through the formative tests. 3. The knowledge and understanding once established escaped pupils' memory after a certain lapse of time. 4. Pupils belonging to the lower rank in the formative tests were not always the same members. We have come to the conclusion that the repetition in the learning of nutrition, which is generally thought to be difficult to understand, is a must not only for the slow learners but also for the rest of the pupils.
