Definition: A detailed description of the individual lessons that a teacher plans to teach on a given day. A lesson plan is developed by a teacher to guide instruction throughout the day. It is a method of planning and preparation. A lesson plan traditionally includes the name of the lesson, the date of the lesson, the objective the lesson focuses on, the materials that will be used, and a summary of all the activities that will be used. Lesson plans are a terrific set of guidelines for substitute teachers.