Why Thinking Skills = To Solve a Problem or to Take a Decision (or even to think of a new Problem!)
Thinking = Being aware of, and challenging our inherent Assumptions / Perceptions + Figuring out Alternatives + Weighing Alternatives + Choosing Optimal Alternative
Being Aware of, and Challenging Assumptions/Perceptions + Finding Alternatives = Creative Thinking
Weighing Alternatives (i.e. analysis, judgment etc) = Critical Thinking
Critical Thinking skills, I think, can be viewed from three perspectives.