This paper describes the rationale and design of a new distributed systems programming model based on events, constraints, and objects 1 . The paper describes the inter-object communication or invocation mechanism, and the way in which concurrency, synchronisation, and timing properties are expressed a n d c ontrolled. The invocation mechanism is unusual in that it is event-based. I t e n c ourages loose coupling among the objects and a high degree o f e n c apsulation for each object. Concurrency, synchronisation, and timing properties are expressed in a uniform way using constraints which may be associated with objects and events.

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B r e n d a n Tangney, V i n n y Cahill, Chris Itorn, Dominic tlerity, Alan J u d g e , G r a d i m i r Starovie, M a r k S h e p p a r d D i s t r i b u t e d S y s t e m s G r o u p , D e p a r t m e n t of C o m p u t e

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