Sorry, but you confuse me more than explain me what a good purpose is.
Pixel posted this:
""After I read this I have a pool of beginner exercises to choose from - for 10 minutes or 60, for the subway or at work - that will be good for health and wellbeing"?
And for the artbooks "After I read this I know better what others have already done on that field so I don't repeat but can contribute something new"
Did I get it? :P at least I can't wait to try again! "
I think his objectives are clear,
(posted by Pixel) "And for the artbooks "After I read this I know better what others have already done on that field so I don't repeat but can contribute something new"
his "Why" is because he wants to know better about what others have already done
and his "How is he going to use it" is he is going to contribute with something new to the field
But you said on your post after he posted that that this is not a good enough purpose, and i asked you on my last post for you to give us an example of a "good purpose" but you probably misunderstood my request thinking that i wanted more explanations of a "good/clear purpose"

Could you just please share a personal example of a purpose you have set for PR a book? I just want to see an example so i can have a better grasp of what a good purpose is like for you.