I have a few courses that share materials and ideas. I used to use the age-old practice of cut and paste to share the slides. As handy as it is, cut and paste causes trouble. If I’m teaching TDD in C and make a change to a discussion that applies also to C++ or or some other language, I’ve got a problem. I’ll never remember to put the change in the other places where the change is needed. This means that later I find myself in front of a group of C++ programmers about to make a big point, and find that the dramatic conclusion added to the C version I made is not in the current slide deck.

As with code, duplication in presentations is a liability. So I needed to refactor my training materials, and need a practical way to deliver them and provide a PDF handout of the presentation.
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