Multiple-valued Logics

This is the final version of a survey on many-valued logic to appear as Chapter 2 of Volume 1 ``Quantified Representation of Uncertainty and Imprecision'' of a ``Handbook of Defensible Reasoning and Uncertainty Management Systems'' to be published by Kluwer. The editors of the Handbook are D. Gabbay and P. Smets, and the editors of Volume 1 are D. Gillies and P. Smets.