The blog post

In this episode, Mark Graban flips roles and becomes the guest—answering five core Lean questions posed by longtime Lean thinker Tim McMahon of the A Lean Journey blog. These questions have been answered by many practitioners over the years, and they cut straight to the purpose, the misconceptions, and the future of Lean.

Mark shares how he first encountered Lean as an industrial engineering student, and how the system came alive when he worked inside the GM Livonia Engine Plant under a NUMMI-trained plant manager. That contrast, and the mentoring from former Toyota and Nissan leaders, shaped his views on what Lean really is: a management system rooted in respect, not a collection of tools.

He discusses the most powerful (and most overlooked) aspects of Lean today, including the central role of psychological safety and why tools fail without the right leadership behaviors. Mark also explores where he sees the biggest opportunity for Lean—particularly in healthcare, where preventable harm, burnout, and broken processes remain stubbornly persistent.

The conversation closes with why these foundational questions still matter. Lean evolves as we learn, and the answers shift as our experiences expand. Mark reflects on how continuous improvement requires an environment where people feel safe to speak up, experiment, and improve their work every day.

If you’re interested in the human side of Lean, how culture and leadership shape results, and where Lean thinking needs to go next, this episode offers a grounded and candid perspective.