Predicted species lists are generated from regional species pools, coupled to codified habitat, microhabitat and biological trait data for the species. At site level, habitat association data are used to tailor the predicted list to site conditions and comparison between predicted and observed species lists is used to explore elements of site quality and site management options involving microhabitat and trait data for the species in the process. It is pointed out that this approach makes possible the interpretation of insect species lists by non-specialist site managers. At larger geographic scales, attributes of regional lists are identified. Throughout, the approach is considered in the context of its potential to contribute to resolution of issues relating to maintenance of biodiversity in Europe and the taxonomic group employed is the Syrphidae (Diptera).