Structuring for Nonfiction Books--How Do You Do It, So Your Reader Can Follow It?

We were taught in school a three-part structuring tool:  Tell them what you're going to tell them, tell them, then tell them what you told them.

While this essay-structure helped me pass my high-school English classes, it never came in handy as I began writing books.  In fact, I had to unlearn that tool, pick up completely different ones.  No longer impr…