This document discusses the importance of documenting outcomes using patient-reported questionnaires in prostate cancer treatment. It outlines how patient-centered outcomes like health-related quality of life are as important as objective clinical measures. It also describes several validated questionnaires that are used to measure quality of life domains affected by prostate cancer and its treatment, such as urinary, sexual, and bowel function as well as general physical and mental health. Principles for documenting outcomes include using validated instruments, relying on patient self-assessment, tracking outcomes longitudinally, and interpreting changes from a patient's own baseline.