In recent versions of professional genre analysis, context has assumed increasingly critical importance, thus redefining genre as a configuration of text-internal and text-external factors. The emphasis on text-external properties of genre has brought into focus the notion of interdiscursivity as distinct from intertextuality, which is primarily viewed as appropriation of text-internal resources. Drawing evidence from a number of professional contexts, this article explores the nature, function, and use of interdiscursivity in genre theory, defining interdiscursivity as a function of appropriation of (...) generic resources across discursive, professional and cultural practices, which, it is claimed, is central to our understanding of the complexities of genres that are typically employed in professional, disciplinary, and institutional communication. (shrink)