Starting with the power shutdown case known to everyone an analysing it after the situation cools down a bit to get into the details of what went wrong is a great hook into the book. Although the book seems very geared toward specific clients of the author and the work done with them, the idea of systemigrams of making pictures of different systems in your organisation and synthesising it into the big picture is easily adaptable for anyone. I think systemigrams will be most helpful when you are going through some transformation, so you can easily see it in the picture - the before and after, if they are as you envision.
