The subject of meaning in natural language is currently investigated both by philosophers and linguists, with different foci, methods, and emphases. The two are typically guided by different concerns and goals (e.g., linguists are central concerned with patterns of cross-linguistic variation and language acquisition; philosophers investigate the normativity of language and the metaphysical presuppositions of particular theoretical claims), but both groups can profit from cross-disciplinary discussions and mutual understanding of their different questions, methods and results. The topic of the 2007-8 workshop will be compositionality: the hypothesis that the meaning of a complex expression is fully determined by the meaning of its parts and the way in which they are put together.