This Technical Specification has three sections, 1) general considerations of design and deployment, 2) data aggregation and data modelling and 3) architecture and technology, and is intended to provide an overall set of guidelines for clinical data warehouse deployment supported by useful descriptions concerning different data aggregation and modelling approaches as well as particular aspects of information architecture that contribute to successful deployment. The first section is of particular interest to healthcare decision-makers, including information technology managers, of requirements and procedures that support successful clinical data warehouse d