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Tadeusz Kotarbiński (1886–1981) was a Polish philosopher, a member of the Lvov-Warsaw School and a direct student of Kazimierz Twardowski’s (a founder of the lws). He contributed to ontology, semantics, ethics (including praxeology), and methodology. Kotarbiński is famous for reism, i.e., a doctrine according to which only concrete things (bodies) exist. There are two widely accepted aspects of reism: ontological and semantic. The aim of this paper is to reconstruct the third aspect of Kotarbiński’s conception: methodological reism. Moreover, Kotarbiński’s reism is discussed in a wider context (its sources and inspirations are presented).