Earlier empirical studies on valency have looked at the phenomenon either in individual languages or a small range of languages, or have concerned themselves with only small subparts of valency (e.g. transitivity, ditransitive constructions), leaving a lacuna that the present volume aims to fill by considering a wide range of valency phenomena across 30 languages from different parts of the world. The individual-language studies, each written by a specialist or group of specialists on that language and covering both valency patterns and valency alternations, are based on a questionnaire (reproduced in the volume) and an on-line freely accessible database, thus guaranteeing comparability of cross-linguistic results. In