Knowledge and skill in performing support duties for complex diagnostic tests and/or specialized practices or procedures, which include preparing the patient, assisting in the diagnostic examination, preparing and handling specialized instruments or other specialized equipment, and monitoring the patients condition before, during, and following the procedure. VHA employees who were converted to appointments under 38 U.S.C. 7401(3) in implementation of Public Law 98-160, enacted November 21, 1983, and for VHA employees converted to appointments under 38 U.S.C. 7405 in implementation of Public Law 99-576, enacted October 28, 1986; and for their future personnel actions under this authority.