Lesson plans are important because they help the teacher completely prepare for the lesson create a guideline for themselves to follow throughout the day. Creating a lesson plan takes a lot of thinking and analyzing to figure out which activities will best fit your students. Some teachers may also do some research to find interesting and fun activities that other teachers use for their lesson plans. It is important to follow lesson plans because, without them, lessons may start to get off track from what the students are supposed to be learning, or the teacher could be totally unprepared for his or her lesson.