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Many manufacturers offer modifications of a product, along with a range of optional components and accessories.

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Deriving a product from a product line requires the involvement and cooperation of heterogeneous stakeholders such as customers, sales people, or engineers. Taking their different roles and needs into account is essential to exploit the possible benefits of product lines. In this paper we present the tool-supported product line engineering approach DOPLER. We demonstrate how the approach supports both nontechnicians and engineers in product derivation and requirements engineering through a set of integrated tools.