I had a great professor in college who, in introducing different kinds of public speaking projects, actually performed the introduction in the method. It was a great way to get an example of how the project should work. And it has stayed with me for 20 years.
Now, when I have the opportunity to demonstrate a skill as I am teaching, I have found that it works far better than describing the skill and then moving into a lab to work on a project. Showing is better than telling in many cases and then, the hand-on practice just supports the demonstration.
