In August 1998 an international workshop on validation, verification and integrity issues of expert and database systems was held in Vienna in conjunction with the Ninth Conference on Database and Expert Systems Applications (DEXA'98). This paper reports on the results of this workshop and summarises the issues identified for future research in this area. Details of the presented papers and some additional information can be found at the workshop WWW site http://www.csc.liv.ac.uk/¸frans/ dexaWorkshop.html. 1 INTRODUCTION Validation, verification and integrity (VV&I) respectively concern the truthfulness of a system with respect to its problem domain, the correctness of its construction, and maintaining the validity of the evolving system throughout its life. This distinction, akin to the differences in traditional software engineering, between these three terms is neatly captured in Bohem's definitions of validation and verification [Bohem 81] and the additional definition of integrit...