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Abstract. Software product line engineering focuses on proactive reuse to reduce the cost of developing families of related systems. A recently proposed method to develop software product lines is delta modeling where a set of deltas specify modifications that should be applied to a core product to achieve other products. The main advantage of this technique is its modularity and flexibility. In this paper, we propose an approach to model check delta-oriented product lines. To this end, we transform a delta model to a corresponding annotated model where an application condition is associated to each statement. An application condition specifies the set of products that a statement is included in them. We present the semantics of the resulting model in form of a featured transition system where each transition is annotated with an application condition. Featured transition systems are supported by a variability-aware model checking technique that can be used to verify the annotated model.

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We present and compare different notions of conformance testing based on labeled transition systems. We formulate and prove several theorems which enable using synchronous conformance testing techniques such as input output conformance testing (ioco) in order to test implementations only accessible through asynchronous communication channels. These theorems define when the synchronous test cases are sufficient for checking all aspects of conformance that are observable by asynchronous interaction with the implementation under test.

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