 This realization confirmed his initial postulate that language consists of "langue" and "discours", "language"and "speech", understood as an operative, potential-to-actual binary, and not as a static dichotomy like Saussure's langue and parole.Guillaume's ongoing analysis of words led him to view each word type or part of speech as the means of incorporating certain syntactic possibilities into words themselves, to be deployed in the sentence.The challenge this poses for a linguist is to find the means of analyzing the preconscious mental operations, the "psychomechanisms" as he called them, giving rise to each part of speech.