Fortunately, lesson plans can contribute toward both. In the case of teaching, these plans are often approved by a committee before they are presented to the glass. This not only ensures that the material provided is appropriate for the class, but it also reflects on the quality of the teacher as well. Once the plans are approved, the teacher is free to use them to educate his or her pupils. However, if the opportunity arises, adding a bit of spontaneity to the class will do wonders for helping to cement it in your students minds. Thus, feel free to leave a bit of wiggle room when planning your plans.
Ideally, grade lesson plans should be orderly and sensible, but with enough room to include spontaneity and creativity. Anyone who has had to sit through a lesson plan that was rigid and tight, with absolutely no deviation from the tasks at hand, will know that this is a thoroughly unpleasant way to learn. Letting your students breathe a little is important in helping them learn and remember.