It is axiomatic that a teacher has a duty to prepare adequately for daily teaching assignments and to plan the semester’s or year’s work in each subject to promote orderly development and progress. Good conscientious preparation of lessons would seem to demand that a teacher know exactly what is to be attempted from the beginning to the end of each lesson period. As well, teachers should have a very clear idea of how they and their students are going to accomplish the objectives set. This requires that teachers make advance decisions as to the method of presentation; proportions of teacher and student activity; student assignments, both in class and for homework; and the audio-visual and other teaching aids that will be used.