Ten Psychological Safety Outcomes, and What They Do and Don’t Prove

Lean Blog by Mark Graban · Aug 19, 2026

The second revised (and expanded) edition of Timothy R. Clark's The 4 Stages of Psychological Safety came out this week. My copy showed up yesterday, and I've been working through it. I've learned a lot from Tim over the years. The first edition gave me language I didn't have for things I'd been trying to describe for a decade, and I went through LeaderFactor's 4 Stages certification, which sharpened it further. He was also generous […] The post Ten Psychological Safety Outcomes, and What They Do and Don’t Prove by Mark Graban appeared first at Lean Blog by Mark Graban.