Critical Thinking's complete Thinking Skill Titles have been family favorites since Joy (now long-graduated) first started homeschool. Comprehensive and engaging, they have only improved since I went through them. In addition, they've added such titles as their Editor-in-Chief series, Word Root series, Visual Perception Skills, Mathematical Reasoning, Mind Benders and much more. These subjects could be intimidating, but instead Critical Thinking Press makes them fun, memorable, and worthwhile.