The document discusses activities and exercises teachers can use to develop critical thinking skills (CTS) in students. It explains that CTS are important for students to efficiently understand and analyze information. The document then lists and describes various classroom activities that can help students develop CTS, including brainstorming, classification, asking open-ended questions, decision-making, group work, accepting different viewpoints, making connections, inspiring creativity, quantitative exercises, and writing papers. These activities encourage students to think independently, consider multiple perspectives, apply knowledge, and express themselves.