||Rule management has been one of the most important extensions to mainstream database technologies. Rules not only can specify active capabilities but also can capture general knowledge in a declarative way. Expert database, active database, deductive database, etc., all deal with rules in addition to the basic relational model and more recently the object-oriented database (OODB) models. This paper introduces a three-dimensional (3D) comparison model which can analyze different approaches for integrated rule and data management, with our specific target being focused on a current major paradigm - modern OODB systems extended with rule management capabilities. A representative selection of modern OODB prototype systems that have been recently developed is then presented and evaluated against the 3D reference model. The paper continues with a discussion of possible applications that can benefit from this paradigm, and finally, concludes with an outlook of future research directions in this area.