What does the title mean? It is the idea that we can approach any electrical or electronic (and mechanical) fault using a basic logical or probability-based investigation to observe and correctly identify the significant indicators that will eventually lead us to the failure or failures. This is no different from the Detective Books you read or TV Shows you watch where the hero used a logical approach (while all those around him just ran around willy nilly) to identify the clues and catch the bad guy. This book is a complete course in Troubleshooting. Along with the written theory explaining my troubleshooting methods, there are over 80 diagrams and drawings, and 50 comprehension questions (with the answers) that will help you monitor how much you understand.