I purchased this new and have read it once. Thank you. This is a set of practical drills and an introductory book to strengthen scientific thinking. Recommended for those who want to improve their thinking skills and practice logical and critical thinking. - Title: Introduction to Scientific Thinking - Author: Ryo Gonyo - Subtitle: Strengthening the Foundation of Thinking - Title: Thinking Skills Improvement Drill - Author: Ryo Gonyo - Subtitle: From Judgment to Scientific Thinking Thank you for looking.