“…In fact, at least three different developmental con-ceptions inspire the theorizing of various proponents: (1) a prevalently Piagetian approach (Ivey, 1986;Rosen, 1989;Bizzini, 1998); (2) an approach based on an Eriksonian stage model (Freeman, 1993) and (3) the one mainly based on Bowlby's attachment theory (Guidano and Liotti, 1983;Reda, 1986;Guidano, 1987Guidano, , 1991Liotti, 1988Liotti, , 1991Liotti, , 1993Liotti, , 1998Anreoli et al, 1991;Perris, 1992Perris, , 1993aPerris, , 1996aPerris, , 1996bLyddon and Alford, 1993;Turner et al, 1994;Cotugno and Benedetto, 1995;Lorenzini and Sassaroli, 1995;. However, some overlap occurs especially between the Piagetian model and the model based on Bowlby's attachment theory (Perris, 1989(Perris, , 1993aLiotti, 1992;Lehay 1995), and between the Piagetian and the Eriksonian model (Layden et al, 1993).…”