This Improvement Leader’s Guide introduces process mapping as a patient engagement component of the PDSA Model for Improvement. Originally developed by the NHS Institute for Innovation and Improvement as part of the “Improvement Leaders’ Guides” series, the guide is now hosted on the NHS Improving Quality website. The guide provides how-to directions on organizing an event to map the patient journey, mapping the healthcare process, and analyzing the patient’s journey once the map is complete. Finally, the guide offers advice on redesigning the patient’s journey around the patient to reveal the best areas for new patient-centred improvement initiatives.