There are a lot of ways, but it comes back to the concept of engagement. Ask the person what “bugs” them about their job, and look at whether Lean Six Sigma could provide a solution. One great teaching tool is FastPitch, which provides a 1-day, hands-on training DMAIC training at a Yellow Belt level. It’s not only a “proof-of-concept” for how Lean Six Sigma works, but it builds momentum and buy-in amongst all levels of participants. If you’ve had some training, you could also invite the person to join your team to work on a project that impacts you both. Any method that involves engagement is good.