For me my purpose is usually dual in nature. My inital purpose is usually along the lines of what I expect from the book in the long term. I.e. how the information in the book is going to serve me in my life when I use it in the long term as well as finding out how I can use it in the long term. This usually helps hone me in one my questions to find the ideas that are useful to me.

My secondary purpose is usually along the lines of finding the information that serves me 'now'. Usually along the lines of how does this information help me and why should I consider it. What do I need to consciously know to use this information...

Alex