The assignment content discusses the theoretical diagnosis of psychological skills in athletes, such as self-confidence and anxiety, using Catastrophe cusp model and Jones' Control Model. It emphasizes the importance of detective work to identify the root cause of the issue and potential areas of diagnosis, including self- confidence, anxiety, attention, motivation, and stress and coping. The content also highlights the need for psychological intervention during sport injury and rehabilitation process to reduce post-injury psychological consequences. The effectiveness of interventions such as guided imagery, relaxation, goal setting, and micro-counseling skills are discussed.