Verb classes are sets of semantically-related verbs sharing a range of linguistic properties, such as: — possible realizations of arguments — the interpretation associated with each possible argument realization The big question: What is the best grain-size for defining such classes, that is, the most useful for understanding member behavior and overall lexical organization? EXAMPLE: Options for the class membership of English run, listed from broadest to narrowest: — COARSE-GRAINED CLASSIFICATION: run is a manner verb (and not a result verb like go). — MEDIUM-GRAINED CLASSIFICATION: run is a manner of motion verb. — FINE-GRAINED CLASSIFICATION: run is a verb lexicalizing a gait characteristic of animates often used with the intent of reaching a goal.

Verb classes are sets of semantically-related verbs sharing a range of linguistic properties, such as: — possible realizations of their arguments — interpretation associated with each possible argument realization A big question posed by the Valency Project: Which facets of verb classification are universal and which language particular? Overview: — Review my general perspective on verb classes. — Introduce a development in my work on verb classes. — Consider its implications for future crosslinguistic studies of verb classes. 1 Introduction: The