This document outlines important terms and skills for critical thinking. It defines three key steps in critical thinking as observe, identify, and classify. Under each step it provides a definition, such as to observe is to watch attentively. It then lists and describes three critical thinking skills: real and fanciful, define and example, and fact and opinion. For each skill it gives examples or explanations, such as the difference between facts that can be proven and opinions that are judgments.