The of roles leaders are determined by the types of groups they lead. too. In evaluating the literature on child preadolescent. and adolescent groups. Denholm and Uhlemann (1986) have devised a three-dimensional model with several components under each dimension The first dimension. developmental level includes three age groupings: children. preadolescents.and adolescents. The second dimension is approach. which is composed of four approaches to group work: activity, discussion. counseling. and therapy. The third dimension. inquiry theme includes three components: theory. research, and practice (see Figure 12.1).