The FIT problem solving principle. Proving what failed before fixing what's broken. - Kevin j Fahy;Kevin Fahy

FIT: Proving What Failed Before Fixing What's Broken is a practical book for engineers who are tired of solving problems that keep coming back. It introduces FIT, a diagnostic problem-solving principle that forces clarity at the moment most methodologies go silent: correctly classifying the problem before fixing it. Rather than offering another framework or set of tools, the book focuses on proving whether a system was ever capable of producing the correct outcome when used correctly. By treating products, processes, tooling, and measurement systems as engineered designs with intent, FIT helps engineers avoid misapplied fixes, unnecessary redesign, and endless tuning. Grounded in real manufacturing experience, this book shows how to think more precisely under pressure - and how to fix the right problem, for the right reason.