Supervision. Authoritative procedural guidance that is for the accomplishment of a function or activity and that -
(1) Includes initial direction and periodic observation of the actual performance of the function or activity; and
(2) Is furnished by a qualified person -
(i) Whose sphere of competence encompasses the particular function or activity; and
(ii) Who (unless otherwise provided in this subpart) is on the premises if the person performing the function or activity does not meet the assistant-level practitioner qualifications specified in § 485.705.