This report is the final deliverable (D7) of the Eurilia (European Initiative in Libraries and Information in Aerospace) project: a three year programme that aims to enhance information access and utilisation of information within the European aerospace sector. The partners involved in this project, which ended in February 1997, were: University of Limerick (UL), Ireland, Cranfield University (CU), UK, Technical University of Delft (TUD), Netherlands, Digital Equipment Corporation (DEC), Netherlands, Sup’ Aero, ENSAE - Ecole National Superieure de Instituto Nacional de Tecnica Aerospacial (INTA), Spain, l’Aeronautique et de l’Espace (SA), France. This project was funded by the EC Action Programme for Libraries. From the outset the project has attempted to focus on user needs within the aerospace sector and the first section of this report summarises the key conclusions of the studies that were conducted at the beginning of the project, all of which focused on the aerospace user. The second section of this report replicated the tests on users which were deployed in the first stage of the project to try to assess what changes had occurred in aerospace information seeking behaviour and attitudes. Section two also presents the results of a lengthy evaluation by users of the Eurilia software and the final section presents the results of the commercial study, which included both an extensive use of software specifically designed to test commercial viability, together with the results of users’ views on the market potential of both the Eurilia software and the content of the