http://en.wikipedia.org/wiki/Critical_thinking
"In a narrow sense, critical thinking has been described as “the correct assessing of statements.”[2] It has also been described popularly and narrowly as "thinking about thinking."[3] It has been described in a much more comprehensive sense as "the intellectually disciplined process of actively and skillfully conceptualizing, applying, analyzing, synthesizing, and/or evaluating information gathered from, or generated by, observation, experience, reflection, reasoning, or communication, as a guide to belief and action"[4] More recently, critical thinking has been described as "the process of purposeful, self-regulatory judgment, which uses reasoned consideration to evidence, context, conceptualizations, methods, and criteria."
You're going to have to ask more difficult questions for that to be a challenge. I didn't have to write a single word.
Anyway, this is why I said you need to break out Intro to Psych. Psych is considerably broader than just a recitation of the DSM IV.