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One of the main problems in feature-based modeling is to represent and to handel the feature semantics as well as the geometric and topological information. In this paper an algebraic representation structure which maps feature shape semantics into a geometric model and provides facilities for interactive feature manipulation is presented. In this structure, called the Feature Entitiy Relation Graph (FERG), the parameters defining a form feature are expressed as algebraically formulated relationships between feature entities. In the same way it is possible to represent dimensions and geometric constraints to express the funcitonal shape requirements of the part and to preserve the feature shape semantics. To enable local as well as global interactions and manipulations on FERG, entities and relationships are structured at different levels of detail

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Feature recognition, integrated with design-by-features, has the potential to support a multiple-view CAD environment, allowing the representation of different feature-based models, that are meaningful for different contexts. They represent a vital step in the direction of product modeHing in Concurrent Engineering. In this paper we present a flexible feature recognition system, in which topological, morphological and geometric information is processed at different Ievels of detail, providing the user with a mechanism that can be tuned to application needs.