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l'he Ada 9X Distributed Systems Anntw [1] supports a comprehensive range of distributed programming paradigms,~is paper txplains the partition model for executing a distributed Ada program and presents a sampling of dtjlerent programming paradigms for interpartition communication using various forms of remote subprogram call. It concludes with a perspective on the contributions of Ada 9X to programming distributed systems.

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During the Third International Real Time Ada Workshop held at Nemacolin Woodlands, Pennsylvania, in June 1989, the present authors formed a study group to review the changes in the Ada standard which would make the language more suitable for programming distributed systems. It was accepted that one of the important advantages of distributing embedded systems was the potential for recovery from partial failure of hardware, and that the techniques of programming recovery from such failure were not well supported by the current form of Ada. The working group made specific proposals, which have since been refined at a further meeting and discussions by electronic mail. The present paper reviews the causes of difficulty, and then outlines the new proposals, explaining their rationale in relation to the identified requirements.