I don't usually like painting methods that are inorganic and formulaic, but I have to admit that The Carder Method
stands out for a few reasons. First, Mark Carder's work is on a much higher plane than I expected, and second, he has created a really cool color checker device to help choose correct colors. Third, his students
seem to do pretty well with it.
I would warn against constructing an entire painting by using dividers and a color checker. I think they're great tools to check your work, but put yourself into it, and don't let the devices make all your decisions.
Here's a page of sample video clips from his DVD
Here's Carder's portraiture website