This document discusses the challenges in sustaining safety standards in high performing healthcare services. It identifies six main challenges: 1) staff engagement, 2) data analysis, 3) feedback and communication, 4) knowledge and technology, 5) leadership commitment, and 6) human factors. For each challenge, it provides examples of issues healthcare services may face and potential strategies to address them, such as increasing staff involvement in change processes, improving data collection and analysis capabilities, establishing a just culture, and ensuring visible leadership commitment to safety. The document emphasizes that achieving high reliability in healthcare requires an ongoing, long-term approach to developing a strong safety culture.