A strategy that can be of great help to you as you strive to improve your instructional delivery expertise is to take notes after you complete a class session.  Many instructors have their lesson plans in notbook binders so they can easily pull out the lesson plans for that session and have them available to work through during class.  When you teach a class be it lecture, demonstration or a combination of the two you have a feeling for how it went.  You know the success points and the areas where you need to make some improvements, add materials or create another assignment.  Since you have just worked through it don't lose this knowledge because by the time you teach this particular unit again you may have forgotten about the things that you were going to do to improve the lesson. 

If there is an opportunity while you are going through the class or immediately after completing the class write down in the margin of the lesson plan some of your obervations and ideas about how the session went and what you want to do to improve it, along with the date.  These ideas are fresh in your mind because you have just lived the experince.  With all that you have to do they do not have to be lenghtly or take a lot of time.  Just notes that will jog your memory when you review them.

Put the lesson plans back into your notebook and move onto preparing for the next class.  When that same class rolls around again and you are reviewing your lesson plans and preparing for the course your notes will trigger your memory about what you were going to do to make modifications in that particular lesson and the course in general.  You will find that these notes are a valuable resource to you because the notes along with the date tells you where  you were in the course and what experiences you had teaching the course at that point in time.  Imagine how great these notes will be because you will have them for all the lessons throughout out the course so you can bring change and/or expansion to each part of the course if you feel it is needed in an orderly and sequential fashion.  This method is a time saver as well because you don't have to spend time trying to remember what you wanted to do with a certain lesson because the notes are there to remind you.