This thesis explores aspects of risk and safety in health care. Patient safety is about preventing harm to patients. A perspective of resilience is used, which is a proactive approach to making care safer. Resilient organisations recognise the fact that work is done in a complex and adaptive system that can be improved, not only by studying what goes wrong, but even more so by studying what works well. The thesis adds to previous research by studying patient safety in first-contact care, primary health care and the emergency department, resulting in new knowledge that could be used to make care safer.