Model definition and management using multiple realizations-case studies in Omola

Presents a tutorial exposition of the syntactic constructs of object-oriented modeling languages that support the programming of multiple realizations. In contrast to previous studies, this paper concentrates on model refinement and management of complexity rather than model reuse. Multiple realizations are used in organizing structure variations, effectively yielding two composite models in the first case study and 240 in the second. Inheritance proves to be a valuable aid in surveying the model definitions and instrumental in containing the spread of complexity.