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Thank you very much for your reply to my message. I agree with you on the idea that logical necessity requires a theory. Piaget's theory of cognitive development and necessary knowledge, however, is inseparable from his clinical or critical method. In its turn, counter-suggestions have a central role in Piaget's clinical method. In other words, if the idea of logical necessity requires a theory, it is not only because of that theory that we can credit a given child with a determined sense of logical necessity. We have to look also at the child's performance on certain tasks. In short, a theory is necessary, but not sufficient, for one to attribute to a certain child a determined sense of logical necessity. Said differently, attributing to a given child a certain sense of logical necessity and necessary knowledge involves both normative facts (i.e., logical and theoretical criteria) and causal facts (i.e., children's performance on determined tasks supposed to appeal to those theoretical or logical criteria). I may be wrong, but this is the way I see the idea of logical necessity or necessary knowledge.