“…First, a number have compared groups of 'overcontrolled' and 'undercontrolled' offenders categorized either on the basis of their scores on Megargee's O-H scale, or on the basis of their criminal and or clinical history (Dutoit & Duckitt, 1990;Henderson, 1983;Hershorn & Rosenbaum, 1991;Lane & Kling, 1979;Lane & Spruill, 1980;Lester, Purdue, & Brookhart, 1974;Lester & Wright, 1978;Quinsey, Maguire, & Varney, 1983;Tupin, Mahar, & Smith, 1973;Verona & Carbonell, 2000;White, 1975;White, Mcadoo, & Megargee, 1973). Second, a number of studies have attempted to identify distinct groups of violent offenders, using cluster analytic techniques (Biro, Vuckovic, & Djuric, 1992;Blackburn, 1971Blackburn, , 1975Blackburn, , 1986Blackburn, , 1996Blackburn & Coid, 1999;Henderson, 1982;Holcomb, Adams, & Ponder, 1985;Kalichman, 1988;McGurk, 1978).…”