This book provides detailed steps for how to solve problems, focusing heavily on the analytical process involved in finding the actual causes of problems. It does so using a large number of figures, diagrams, and tools useful for helping make our thinking visible. The primary focus is on solving repetitive problems, rather than performing investigations for major incidents/accidents. Most of the terminology used is everyday language and can be used for both workplace and personal applications. Many of the examples will involve situations with which the reader will likely be familiar. The focus of the book is not on statistics but instead on the logic of finding causes. It has sometimes been described in training workshops as "Six Sigma lite" ...problem solving without all the heavy statistics.