By providing the necessary methods in the form of a reference system, Tobias Wille offers a simple way to comprehensively assess progress during a company's transformation towards Lean Thinking. The operationalization of the reference system results in a practical and easily applicable evaluation logic that can be tailored to the specific production system of the company being assessed. The evaluation not only provides insights into the current state of implementation but also serves to derive meaningful next steps. The reference system measures organizational change across the dimensions of understanding, implementation, and results, with each of the three modules being designed accordingly, resulting in nine methodological components.