Many database applications are currently confronted with the problem of migrating from relational to object-oriented systems. A central task in such a process is schema conversion, which so far has to be done in a way that specifically depends on the target system. Recently, the ODMG-93 proposal has established a framework in which the core aspects of an object-oriented schema can be made precise, so that it becomes possible to do schema conversions in a system-independent way, by using the ODMG model as target. This paper presents a methodology for transforming relational schemas into object-oriented ones according to ODMG-93, thereby rendering it possible to do reverse engineering computer-assisted, and to automize database migrations. Es...