I have been fortunate to teach at the college level for several years now and have found that even when teaching the same course, no two lesson plans are identical. They might be close, but never the same. Each class is a different make up of students. Each semester, I find myself adjusting the rate of content delivery for specific areas and having to review or reinforce some areas more than others. There are trends, and my lesson plans usually don't change drastically, but it has been enormously helpful to be fluid and dynamic when pacing a course, even if I've taught it a few times.