Dr. Horak has developed a Balance Evaluation Systems Test (BESTest) for clinicians to differentiate balance into 6 underlying systems that may constrain balance: Biomechanical, Stability Limits, Postural Responses, Anticipatory Postural Adjustments, Sensory Orientation, and Dynamic Balance during Gait and Cognitive Effects. This unique evaluation tool is appropriate for any age and severity of ambulatory patients with Parkinson's Disease, Cerebellar Ataxia, Vestibular Disorders, Neuropathy, Head Injury, Multiple Sclerosis, Stroke, Cerebral Palsy, Cognitive Deficits, and other balance disorders. The BESTest is a sensitive, quantitative balance assessment that will improve third party reimbursement by identifying subtle deficits and changes with therapy.