ABSTRACT
The magnetic tape recorder has made it possible for those who train teachers to offer something more than verbal criticism of the lessons they supervise. The children, while relaxed and easy in their relationship with the teacher, were stimulated and challenged by the content of his lesson so that they worked with great energy. The double experience of hearing the tape recording of a lesson and of studying the graphic analysis of the interaction between himself and his class may have a marked effect on lessons given by him subsequently. The lessons in which children have been really interested are characterised by a continual interchange of teaching techniques. Question and comment, reading and acting, writing by the teacher on the blackboard or by the pupils in note-books—any or all of these may be involved in a lesson, but a student who relies for too long on any one of them may lose the interest of his class.
