The document outlines 6 stages of critical thinking development: 1) Unreflective thinker - People at this stage do not notice their assumptions and biases in thinking. 2) Challenged thinker - People become aware of problems in their thinking and lack of self-monitoring. 3) Practicing thinker - People recognize the need to systematically improve their thinking and develop awareness of better thinking habits. 4) Advanced thinker - People have good command over biases and strive to be fair-minded, while identifying areas they can improve. 5) Accomplished thinker - People have taken charge of their thinking, regularly assessing to improve clarity and reduce biases. 6) The accomplished thinker