This book describes an intriguing method of group analysis and problem-solving. The method was first devised by the senior author in 1925 while trying to organize a “drawer full of notes,” and it received significant impetus when the second author became involved in 1979. Essentially, the Crawford slip method is a process of collecting single-sentence ideas on slips of paper (1/8 letter-size page), organizing the slips, analyzing, and then acting on them. While this sounds simple and straightforward, the book is a detailed description of procedures, explanations, caveats, and cautions that have been learned and refined over the years of application of this methodology to a wide range of problems.