With emergence of new models, architectures and midlleware such as ODP, TINA and CORBA for developing open distributed systems, testing technology requires adaptation for use within conformance assessment in such systems. All these frameworks are object-based and aim at creating open distributed environments supporting interworking, interoperability, and portability, in spite of heterogeneity and autonomy of the related systems. In this context an open distributed system may be viewed as a system providing standardized distributed interfaces for interacting with other systems. Conformance of such a system can be assessed by attaching a related tester at each provided interface. However, many problems of controllability and observability influencing fault detection during the testing process arise if there is no coordination between the testers. In this paper, we show how to cope with these problems by using a distributed test method derived from OSI conformance testing. Afterwards, a CORBA prototype is designed, realized and experimented with a forum application. 1.

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