Whatever the age of your pupils and regardless of the subject you teach, lesson plans can help you to ensure all course content is covered and help to make sure nothing important is missed out. A lesson plan is simply a detailed description of what materials are to be covered within an individual lesson.
A list of objectives can help you to gauge whether or not your students have achieved everything they should have once the lesson is over. Depending on the subject matter, objectives might be practical, for example, what can the student do at lesson completion. The objectives could also be knowledge based, for example, what does the student know after the lesson is complete.