Lean manufacturing methods have, over the years, become a kind of brand. Some practitioners and theorists advocate for the blind application of Lean methods, regardless of the current state of the company where they are being introduced. We believe this is not the best approach to Lean methods, as their implementation heavily depends on the maturity of the individual company. Similarly, deciding to implement a Lean method based on a book, an internet article, or similar sources is also questionable. A Lean method is a framework—a written law, so to speak—that is then interpreted by a judge who, based on practice, experience, and, of course, the aforementioned framework, delivers a final opinion.