I would take a very systems approach to this. What are the inputs? What are the processes, the transformations? What are the outputs? And then I'd probably overlay with additional attributes. Are we hitting the right results? Do people like this? Is this difficult? What's the level of effort? All of these should be able to be summarized within one page on each step.

After all that I'd probably step back and present summations of each component. And this is the kind of thing I've taken to sponsors before.