Prior to the initial interview or within seven calendar days of departmental notification of duty to supervise the conditional releasee, the probation officer shall review any probation reports, supervision history information and any other pertinent information available relative to the individual whose supervision he has been assigned, determine the appropriate classification level of supervision, initiate a needs assessment process and develop an individual plan of supervision. The form of such instruments and processes and their content shall be prescribed to the State Director of Probation and Correctional Alternatives. Prior written approval of the State Director of Probation and Correctional Alternatives must be obtained to vary the form or content of such instruments or processes.