What is left of this initial project once Kotarbiński’s textbook became obsolete – as Kotarbiński himself claims, perhaps too modestly, in the preface of its second edition, in 1959 – and also given the strong criticism of reism, particularly by Kazimierz Ajdukiewicz [1966]? My answer is that the philosophical project of reism then became a methodological framework for intellectual work in general, and in particular for humanistic studies, or what we today call the Human and Social Sciences.