Can Jean Piaget explain the possibility of knowledge?

The purpose of this article is to show that Piaget's use of the equilibrium principle cannot explain the possibility of correct understanding. That is, it cannot explain the possibility of knowledge, as opposed to simple change in belief. To make the argument, I begin by describing Piaget's explanatory model, which is known as the equilibrium principle. I then argue that correct understanding, or knowledge of any x as a case of y, requires a concept of correctness, i.e., the recognition that words and concepts apply under some conditions but not others. I try to show that because he uses the equilibrium principle as a basis for his explanation, Piaget cannot explain how a concept of correctness is acquired. Finally, I argue that to explain the possibility of knowledge, one must show how the conditions for word and concept application are determined by a community of language users. Again, I claim that Piaget's use of the equilibrium model precludes such an account.     

Conceptualising,designing and drafting a monthly multi-family therapy programme and manual for adolescents with anorexia nervosa

The written transmission of therapists' expertise in manuals is an important issue which is highlighted in the literature. Manuals are essential for research, training and therapeutic guidance. However, the conceptualisation, design and drafting of therapy manuals have received little attention. Our team conceptualised and designed a 10-monthly session multi-family therapy programme for adolescents suffering from anorexia nervosa. This paper presents the methodology used to evolve from training and theoretical models to designing a programme and drafting the accompanying manual. We then describe how our team reached a consensus regarding the role to be attributed to food-related symptoms in the programme. These arduous tasks were rewarded by fruitful discussions among team members, which led to a shared theory of treatment. The methodology presented here is drawn from both the experience of specialised teams and from that of families in providing care to adolescents with anorexia nervosa.