That's a perfect purpose if that's what you want to get out of the book. You do not need to be 100% clear in your purpose because, from my own personal experience, if you know roughly what you want to get from a book but have a feeling about what you would like to get out of a book, even if you can't verbalize what that is, you brain will intuitively know why you're PhotoReading it. Your feelings of why you're PhotoReading is as just as viable a form of communication with your brain as words are. Of course, if after PhotoReading the book for general information, you would like more specifics then you can either follow-up with more specific super reading and dipping sessions, or you can rapid read the book or even PhotoRead the book again but this time refine your purpose. Hope this helps.
~NeverSpeak
