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Psychological Safety
Edmondson develops teaming from studies of people learning interdependent work under uncertainty, including a sixteen-hospital comparison of cardiac-surgery teams adopting a new procedure. The evidence shows how framing, preparation, speaking up, boundary spanning, and reflection accompanied successful implementation; the broader claim that fluid collaboration can be led is a conceptual synthesis, not a single experimentally proven formula.
Edmondson traces psychological safety to a hospital study in which units described as better-performing also had higher detected medication-error rates. She interpreted the reversal as evidence that some units surfaced more errors; later studies support associations with learning, voice, and performance, but neither the founding design nor the broader literature proves that the book's leader practices cause those outcomes.