Abstract: A method for providing to a user a solution element from a predetermined list of solution elements involves storing a first table with solution elements, question elements, and for each pair of solution element and question element, a determining parameter indexing a level of concordance between said question element and said solution element, generating a second table, successively providing to the user a plurality of question elements from the second table, acquiring from the user an information element in response to a question element provided to the user, identifying one or a plurality of improbable solution element(s) from the second table, modifying the second table by removing the improbable solution element(s), and providing to the user a remaining solution element from the second table when no question element that enables to identify an improbable solution element from the second table remains in the second table.