The paper proposes an intermediate modeling ground that bridges the gap between engineering design models and marketing models for the development of platform-based product families. In this model, each variant in the product family is assumed to contribute a percentage to the overall market coverage inside a target market segment and we wish to maximize this coverage subject to an available development budget. Following the conceptual engineering design phase of the product family, this model will optimize the initial investment in the platform, the commonality level between variants, and the number of variants to be produced in order to maximize market coverage. An application of the model using a Drill product family is included to demonstrate the usefulness of the proposed model.

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