The paper deals with Aristotelian logic as the special case of more general epistemology and sociology of both science and common sense. The Aristotelian principles of identity, of noncontradiction, and of excluded middle are to be supplemented by the secondorder cybernetic, or "cybernethic" principles of paradox, of ambivalence, and of control. In this paper we collect some ideas on how to eva...

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U Mattsson and Gross have discussed the “coping mechanisms” which are used in successful adjustment to hemophilia in boys and young men2. In their study of 35 hemophiliac boys and young adults, 27 were considered to have adapted well at school, in the home, and with their peers, with few limitations except for those realistically imposed by the disease. In those instances of failure, difficulti...