How to make notes in non-fiction reading

An easy guide on how to take notes and group important information while reading non-fiction.

The Story
Five years ago, I opened "A Brief History of Time," physicist Stephen Hawking's classic treatise on Time, with a great deal of excitement.

Intuition suggested that I devise a method to understand the book. I developed this brief annotation guide which helps me classify my thinking. Works very well most most non-fiction.


Key:
(!) Important/ Info
(Check mark) Fact
(?) Question
(\) Idea
(u) Understanding
( ) Anything else