||This paper reviews work in progress concerning information modelling in supportof enterprise engineering, and discuses how important modelling challenges arebeing addressed to support more cost effective development of offshoreinstallations for oil production in the Norwegian part of the North Sea. The paperdescribes a framework and a methodology for information modelling of realworld project enterprises and presents initial application examples from theoffshore oil and gas industry.CAESAR Offshore is a research program undertaken jointly by Norwegian oilcompanies, engineering ms, research institutions and the Norwegian ResearchCouncil, with the aim of utilising information-technology-based methods and toolswhich lead to more cost effective field development and operation. As a part ofCAESAR Offshore we are developing an object oriented system architectureconsisting of a framework and methodology for information modelling, based onour belief that complete and correct enterprise models of development projectsmust include both the project requirements, deliverables, activities andorganisation. Thus information models of projects must represent both theobjective, product, process and organisation dimensions. Based upon a model of engineering design, we explicate and relate the enterprisedimensions, and outline a way of describing the difference between plannedaction and actual behaviour. We implement our model architecture according toan information meta-model, based on a set of common reference entities, and ageneral offshore reference model. In our work we are using the offshorereference model, as the basis for modelling offshore platforms, design ofhydraulic system for offshore production units, and project control systems forengineering design projects.