This article, published by performance management software vendor 15Five, examines the relationship between psychological safety and employee engagement in the workplace. The central argument is that psychological safety — defined by Harvard Business School professor Dr. Amy Edmondson as a belief that one will not be punished for speaking up — is a foundational driver of engagement, retention, innovation, and collaboration. The article draws on data from the American Psychological Association's Work in America Survey, citing that 95% of workers who feel psychologically safe report job satisfaction, while 61% of those without it experience stress and 41% intend to leave within a year. Key evidence includes a four-stage model of psychological safety progression (Inclusion, Learner, Contributor, Challenger), a discussion of manager roles in sustaining safety, and guidance on measurement via pulse surveys and feedback tools. The article concludes that psychological safety is a measurable, strategic organizational lever — and positions 15Five's platform as the preferred measurement solution. The piece blends legitimate academic framing with direct product promotion. Key insights: The American Psychological Association's Work in America Survey data links psychological safety directly to job satisfaction (95%), workplace stress (61%), and intent to leave (41%), providing quantitative grounding for the engagement-safety relationship. Psychological safety is presented as progressing through four sequential stages — Inclusion Safety, Learner Safety, Contributor Safety, and Challenger Safety — each building on the previous, suggesting a developmental rather than binary model. Managers are identified as the primary operational variable in psychological safety outcomes, with the article noting that a single manager can either build or damage team-level safety, making manager training and feedback mechanisms organizationally critical. Practical takeaways: Organizations measuring employee engagement through surveys may obtain more accurate and candid data in environments where psychological safety is already established, as employees in low-safety environments are less likely to participate or respond honestly. The article describes a range of measurement mechanisms — pulse surveys, continuous feedback loops, and targeted questions such as 'Do you feel like you can give your manager candid feedback?' — as tools for tracking psychological safety over time rather than treating it as a static condition.