For sport science professionals, qualitative movement diagnosis (QMD) is a critical skill in helping individuals improve performance or reduce injury risk. This new edition focuses on the processes behind movement observation, assessment and diagnosis, emphasising how to recognise and correct errors in human movement. It enables anyone working in professions related to human movement to integrate and apply knowledge from the fields of sport movement, allied health and biomechanics to help their clients, patients or athletes improve their movement performance or move with a lower risk of injury. It provides students, teachers and researchers with a practical diagnostic framework, tutorials to guide them through the QMD process, advice on capturing relevant information from motor performances and descriptions of intervention strategies. Exploring the the processes behind assessment and diagnosis of movement technique.