Thinking Skills Logic Pre-K : Paperback : Kumon Publishing North America, Inc : 9781941082249 : 1941082246 : 15 Aug 2015 : Our thinking skills workbooks strengthen critical thinking skills that are crucial for a lifetime of success. Through a variety of fun and colorful activities, children gradually master spatial reasoning, differentiation, logic, and creativity. Your child will advance without being overwhelmed or frustrated with our uniquely effective and gradual step-by-step progression.