Are you planning on teaching a class? If so, lesson plans provide you with a variety of different advantages. Any experienced teachers will tell you that having a plan does wonders for smoothing out the most chaotic of classes. Others, however, will tell you that sticking too closely to the plan will make things needlessly complicated and that flexibility is the key to running a sound classroom. In truth, both sides have merit; the best way to run a classroom, particularly one filled with younger, excitable students, is to maintain a perfect balance of order and creativity.
Lesson plans are great for other settings as well. For example, if you plan on retraining your staff to use a certain piece of software, a plan can help keep them on task and give them a goal to work for each day. This will allow you to incorporate these new lessons into their workday without a significant decrease in their normal jobs. Having a fixed set of tasks to learn also helps employees stay organized and on task.