Engineers at the Royal Academy of Engineering are working to tackle some of the world’s most complex challenges. When the Department of Health enlisted their expertise to address delayed patient discharge from NHS hospitals, we helped them turn their detailed findings into a clear visual summary. Challenge: Delayed patient discharge - sometimes known as "bed-blocking" - in the NHS is a problem that affects us all. In a fascinating collaboration, the Department of Health and Social Care turned to the Royal Academy of Engineering to use their expertise in systems thinking and managing complex processes to identify the true causes and potential solutions.