On-site is defined as “on the premises and readily available to respond.” On-site supervision is required for those working with a temporary license, as well as for PT aides. Generally, on-site means in the same building; however, the size of the building, the acuteness of the patient, and other factors that are unique to each situation may affect the definition in each case. If the supervising PT or PTA is in one building and the temporarily-licensed person or aide is in another building providing physical therapy services, that does not qualify as on-site supervision. The supervisor must be readily available, and within reasonable proximity. See the Board rules, §321.1