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.

As the world's leading supplier of metallurgical plants, Siemens VAI provides integrated and universally applicable continuous casting systems for the steel industry. The complexity of the process of casting liquid steel is supported by software products that enable high-quality steel casts and efficient plant performance. Over the last recent years Siemens VAI developed a flexible software product line. The system has been classified as highly reliable, which implies rigorous and systematic testing throughout all phases of the development lifecycle. In this paper we investigate how testing is embedded in the development lifecycle and how various testing methods are applied to ensure high software reliability. The lessons learned distilled from over five years of project experience discuss practices that contributed to the current testing approach.

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