This paper outlines an ontology for characterising architecture frameworks. The ontology is based on the metamodel of MAF, and is currently being tried out on a set of well-known existing frameworks. Selected results from this trial are presented. 1 Background and motivation During the last couple of decades, quite a few architecture frameworks have been presented. While they differ considerably in a number of respects, their application domains tend to overlap, hence potential users need to be able to compare frameworks with each other. Although some work is performed concerning architecture framework issues [1, 2], we have not been able to find a generally applicable, simple framework for assessment and comparison of architecture frameworks. As a first step towards such a mechanism, this paper outlines an ontology for characterising architecture frameworks. An architecture framework may be viewed as a set of rules, guidelines and patterns for describing the architecture of systems. A...