ABSTRACT
Model management research has been active for roughly a decade now and it’s not stretching the truth to say that, during this period, model management has been model definition. Great effort and progress have been made in developing general model representations 1 in the form of executable modeling languages which lend them selves to computer manipulation. Structured modeling [15], logic modeling [26], and graphgrammars [22] are examples of model representa tion formalisms which have advanced the field significantly.
