For college "stuff" a general idea is NOT enough to do good in the class

However, if you want a "general" idea then you can use that to start forming your purpose. Even though you want the general idea, there are usually subsections/subheadings to the topic. State your purpose with those subheadings. It is not imparative that you etch the purpose in stone; however, when you establish your purpose, you should feel inside a sense of direction.
Just for the record, i started the photoreading course with my quantumn mechanic text book.......don't let yourself fall into the belief that if you don't read an easy 200 word book with lots of subheadings, you never learn the system.
[This message has been edited by Elmo9 (edited May 06, 2001).]