# What is PS?

*Tom Geraghty · History & Foundations, Models & Critique*

The foundational definition, building on Edmondson's 1999 formulation: psychological safety is an emergent property of a group, not a personality trait, a vibe, or a management technique. When a group has it, people can reasonably predict that others will react positively when they speak up, ask for help, admit a mistake, or challenge an idea — and that positive predictability is what makes the risk feel worth taking. Ambiguity about norms, expectations or purpose is one of the most reliable ways to silence people. Traces the convergent history (Rogers in the 1950s, Schein and Bennis in the 1960s, Kahn in 1990, alongside aviation human factors, Deming's 'drive out fear', and Toyota's Andon Cord) to argue there is far more evidence about what works than a casual reading suggests. Clarifies what PS is not: not comfort, not niceness, not the absence of accountability, and not something leaders simply bestow from above (the leader-centric framing is a subtle version of the problem it claims to solve). Sets out the two-gate model of silence — ambiguity failure (people can't read whether raising something is appropriate) and valence failure (people see the problem clearly but the personal cost feels too high) — and shows how steep power gradients drive the second. Covers the benefits (faster learning, fewer and better-caught errors, retention), the least-safe-person principle, the relationship with accountability and just culture, Clark's four-stage model, Westrum's typologies, the work-as-imagined vs work-as-done gap, and the cautions around measurement.

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## Connected concepts (37)

- [Core Principles](https://explore.psychsafety.com/n/our-core-principles.md)
- [Psychological Conditions of Personal Engagement and Disengagement at Work](https://explore.psychsafety.com/n/kahn-1990.md) (paper)
- [Psychological Safety and Learning Behavior in Work Teams](https://explore.psychsafety.com/n/edmondson-1999.md) (paper)
- [The Fearless Organization: Creating Psychological Safety in the Workplace for Learning, Innovation, and Growth](https://explore.psychsafety.com/n/edmondson-2018.md) (paper)
- [PS & Trust](https://explore.psychsafety.com/n/the-difference-between-trust-and-psychological-safety.md)
- [Towards a Theory of Creativity](https://explore.psychsafety.com/n/rogers-1954.md) (paper)
- [Affect- and Cognition-Based Trust as Foundations for Interpersonal Cooperation in Organizations](https://explore.psychsafety.com/n/mcallister-1995.md) (paper)
- [Managing the Risk of Learning: Psychological Safety in Work Teams](https://explore.psychsafety.com/n/edmondson-2002.md) (paper)
- [Methodological Fit in Management Field Research](https://explore.psychsafety.com/n/edmondson-mcmanus-2007.md) (paper)
- [Psychological Safety, Trust, and Learning in Organizations: A Group-Level Lens](https://explore.psychsafety.com/n/edmondson-2004.md) (paper)
- [Psychological Safety: The History, Renaissance, and Future of an Interpersonal Construct](https://explore.psychsafety.com/n/edmondson-lei-2014.md) (paper)
- [Speaking Up in the Operating Room: How Team Leaders Promote Learning in Interdisciplinary Action Teams](https://explore.psychsafety.com/n/edmondson-2003b.md) (paper)
- [What People Get Wrong About Psychological Safety](https://explore.psychsafety.com/n/edmondson-kerrissey-2025.md) (paper)
- [Coming to a New Awareness of Organizational Culture](https://explore.psychsafety.com/n/schein-1984.md) (paper)
- [History of PS](https://explore.psychsafety.com/n/the-history-of-psychological-safety.md)
- [Sociological Safety](https://explore.psychsafety.com/n/sociological-safety.md)
- [Definition of PS](https://explore.psychsafety.com/n/the-definition-of-psychological-safety.md)
- [High Performing Teams](https://explore.psychsafety.com/n/high-performing-teams.md)
- [How Can Organizations Learn Faster? The Problem of Entering the Green Room](https://explore.psychsafety.com/n/schein-1992.md) (paper)
- [Project Aristotle](https://explore.psychsafety.com/n/googles-project-aristotle.md)
- [Project Aristotle: Guide to Team Effectiveness](https://explore.psychsafety.com/n/project-aristotle-guide-to-team-effectiveness.md)
- [Psychological Safety 101 Course](https://explore.psychsafety.com/n/psychological-safety-101-course.md)
- [Psychological Safety Books](https://explore.psychsafety.com/n/psychological-safety-books.md)
- [Psychological Safety: A Timeline](https://explore.psychsafety.com/n/psychological-safety-a-timeline.md)
- [Psychosocial Safety](https://explore.psychsafety.com/n/psychosocial-safety.md)
- [Schein's Three Layers of Culture](https://explore.psychsafety.com/n/psychological-safety-edgar-scheins-three-layers-of-organisational-culture.md)
- [The Limits of Psychological Safety: Nonlinear Relationships with Performance](https://explore.psychsafety.com/n/eldor-hodor-cappelli-2023.md) (paper)
- [The PS Framework](https://explore.psychsafety.com/n/psychological-safety-framework.md)
- [Westrum's Typologies](https://explore.psychsafety.com/n/psychological-safety-81-westrums-cultural-typologies.md)
- [What PS is Not](https://explore.psychsafety.com/n/what-psychological-safety-is-not.md)
- [Four Lenses of PS](https://explore.psychsafety.com/n/the-four-lenses-of-psychological-safety.md)
- [Is Your Team Psychologically Safe? Take This Quiz.](https://explore.psychsafety.com/n/is-your-team-psychologically-safe-the-ten-statement-quiz.md)
- [PS 101: Fundamentals](https://explore.psychsafety.com/n/psychological-safety-101-fundamentals.md)
- [PS at Work Overview](https://explore.psychsafety.com/n/psychological-safety-51-psychological-safety-at-work.md)
- [Reflections Pt 1: The Power of Naming](https://explore.psychsafety.com/n/reflections-on-psychological-safety-five-years-of-learning.md)
- [Things You Might Hear When a Team Feels Psychologically Safe](https://explore.psychsafety.com/n/things-you-might-hear-when-a-team-feels-psychologically-safe.md)
- [The PS Knowledge Map](https://explore.psychsafety.com/n/the-psych-safety-knowledge-map.md)