“…Their mean scores on the VPI resulted in the code ISA, which matches the first three letters of Holland's letter code for physicians. Holland (1985b) reported that other studies (Fabry, 1976;Fishburne & Walsh, 1976;Florence, 1973;Gaffey & Walsh, 1974;Holland & Holland, 1977;Hollifield, 1974;Horton & Walsh, 1976;Johnson & Moore, 1973;Matthews & Walsh, 1978;O'Brien & Walsh, 1976;Spokane & Walsh, 1978;Sullivan, 1974;Wiggins, 1976) in which the VPI or the SDS was used demonstrated that occupational codes were usually accurate, that is, congruent with SDS or VPI results.…”