 In view of the fact that test subjects seem to perform very poorly in various paradigmatic reasoning tests (e.g., Wason’s Selection Task  (Wason 1966)  or the Supression Task  (Byrne 1989)),  main streams in the psychology of reasoning have traditionally ascribed to logic at best a subordinate role in human reasoning. In recent years this assessment has been criticized as the result of evaluating performances in tests against the standard of classical logic whereas other standards based on probabilistic considerations or on NMLs have been argued to be more appropriate. 