One of the Thinking Tools. Within the framework of Skepticism, critical thinking is the mental process of acquiring information, then evaluating it to reach a Logical conclusion or answer. Critical thinking is synonymous with informal logic. http://www.wikipedia.org/wiki/Critical_thinking
I feel like Critical Thinking is useful at dissecting other people's ideas, and maybe challenging your own, but doesn't help much in creating anything (D And D), nor does it help weigh out all the uncertainties and Side Effect-s of reality...
There is a WatsonGlaserCriticalThinkingAppraisal instrument.