We first describe the main features of Malinowski's book
Many-Valued Logics: its orientation and its contents. The
rest of our paper is devoted to the discussion of its original
point, the presentation of Suszko's thesis, and questions directly
related to it: What is many-valuedness? Are there only two
truth-values?
¶ We analyse and discuss the characterization of many-valuedness
and the reduction of many-valuedness to two-valuedness
presented by Malinowski. Then we argue against Suszko's thesis,
taking examples of paraconsistent logic and of Malinowski's
inferential many-valuedness. However, we also present some arguments
to reject supplementary truth-values in the case of two
topics discussed by Malinowski: modality and partiality.