A type of clinical outcome assessment. A measurement based on standardized task(s) actively undertaken by a patient according to a set of instructions. A PerfO assessment may be administered by an appropriately trained individual or completed by the patient independently. PerfO assessments include:

• Measures of gait speed (e.g., timed 25 foot walk test using a stopwatch or using sensors on ankles)
• Measures of memory (e.g., word recall test)