This is an excellent little book quantifying and systemitizing a type of thinking that is often lauded and encouraged in secondary education without ever being fully defined. I like the way the authors disect critical thinking into its components to help the reader improve his skills, learning how to ask questions and identify gaps in reasoning to come to solutions to problems. The last page came across a little propagandistically, more like a manifesto for a critically thinking humanity than an encouragement to the value and virtue in critical thinking. In fact, if the rules of critical thinking outlined in the booklet are applied to the booklet itself, one sees that there is an underlying assumption that critical thinking is intrinsically better than other less broad types of thinking. Is there nothing in a culture or philosophy that should be taken as axiomatic, giving guidance to all other considerations? Perhaps not, but it is a very humanistic view that bears crititical analysis.