Critical Thinking – Single Units Our Critical Thinking course, one lesson at a time. $25 Critical Thinking Unit 1 See more... $25 Critical Thinking Unit 2 See more... $25 Critical Thinking Unit 3 See more... $25 Critical Thinking Unit 4 See more... $25 Critical Thinking Unit 5 See more... $25 Critical Thinking Unit 6 See more... $25 Critical Thinking Unit 7 See more... $25 Critical Thinking Unit 8 See more... $25 Critical Thinking Unit 9 See more... $25 Critical Thinking Unit10 See more... $25 Critical Thinking Unit11 See more...