The document discusses how to effectively "sell Lean" or introduce Lean concepts to managers. It recommends focusing on improving measurable outcomes managers care about like efficiency, speed, and quality rather than trying to directly sell Lean thinking. The approach is to identify a predictor metric that affects the desired outcome, measure it, and show how reducing the predictor through Lean tools can positively impact the outcome. For example, to increase speed, measure work-in-process and demonstrate how lowering WIP through Lean techniques increases cycle time and speed.