Functional assessment measures an individual's ability to perform tasks over time. It is important in physiotherapy to develop treatment plans. Current measures include impairment tests of body parts, self-report measures of pain and function, and physical performance measures integrating multiple abilities. Physical performance measures are increasingly used and compare to impairment tests which measure isolated components. Future directions include investigating combinations of assessments to best predict function and injury, and considering psychological and social factors. Research with long-term studies is still needed.