We only claim what the research carries.
The Psychological Safety Programme is built on a small number of well-replicated findings — not on workshop folklore. These are the sources behind the claims you'll see in the assessment and the season, so you can check them yourself.
Administrative Science Quarterly, 44(2). The paper that defined and first measured psychological safety — including the 7-item scale still used in research today.
Google's internal study across 180+ teams. Psychological safety emerged as the single strongest differentiator of high-performing teams — ahead of composition, seniority, and individual talent.
Wiley. The practitioner's summary of two decades of research: what psychological safety is (openness under pressure), what it isn't (harmony), and how leaders build it.
A meta-analysis covering over 1.2 million employees: people who use their strengths daily are far more likely to be engaged at work (the "6×" figure quoted in chapter 2).
The New York Times Magazine. The accessible long-read on Project Aristotle — a good first source to share with your team.
Our team assessment is a short, practical pulse check: it makes the team's perception (and the leader-team gap) visible and trackable over the season. It is a working instrument for teams, not a validated clinical scale — for peer-reviewed measurement, Edmondson's original 7-item scale (1999, below) remains the reference.