“…This problem has to do with those instances in which younger subjects sometimes perform with greater competence than they would be predicted to do in the models concerned, while some older ones perform less well than they "should" according to the models' logic. In such cases there is a broader spread of competencies in relationship to age and stage than we "should" expect in the models' conceptions of stage and their relationship to development across the life cycle; f ) Piaget's supposition that formal operations should obtain by late adolescence has been unverifiable; some adolescents "make it" to formal operations, while many do not; g) On a related note, Piaget's model did not account for the prospect of post-formal operations, and where post-Piagetian models have tried to do so, there has not been, at least until very recently, a clear consensus among them as to how many have been found, and what their relationships are to one another, and to formal operations; h) Finally, there has been a proliferation of stage models in a variety of domains (ego development, parental development, aesthetic development, emotional development, role-taking development, identity development, intellectual development, moral and religious development) with no clear explication of how models are, or ought to be, related across domains (Commons & Pekker, 2005;Day 2008aDay , 2010b.…”