This hands-on guide shows teachers how to develop students thinking skills across the curriculum through a framework of mediation. The book details 21 essential critical thinking skills, using case examples from real classrooms to illustrate each skill. The acronym MiCOSA, Mediation in the Classroom: An Open Systems Approach to critical thinking and learning, captures the essence of the model. It supports thoughtful delivery of the Common Core State Standards, as well as transfer of learning to prepare students for independent thinking beyond the classroom. Multiple video clips* and over 200 classroom strategies, from conventional to technological, augment and support examples of the mediation. When educators follow the MiCOSA Model, students begin to think more deeply, clearly, and precisely, and become engaged with 21st century learning, with critical thinking, collaboration, and innovation at the core.