“…Since this is an expensive treatment method it must be thoroughly evaluated. Some evaluation studies of different size, design and ambition have been made (Johnson and Savage, 1967;Abroms et al, 1971;Ro-Trock et al, 1977;Ringstad and Spurkland, 1978;Churven and Durrant, 1983;Dydyk et al, 1989;Larsen and Eldrup, 1989) showing the model's effectiveness. In Sweden there are a number of minor evaluation studies (Braaf and Hedlund, 1981;Sundelin et al, 1991;Hansson et al, 1992;Lindberg, 1993;Nerström-Bjerre, 1993;Johansson, 1995;Sköld and Österholm, 1995;Abrahamsson, 1996).…”