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Problems Facing Group Membership Specifications for X-by-Wire Protocols

A guarantee is only as good as its assumptions. Three group membership areas defy firm, practical guarantees: transient faults, reintegration, and large groups. We show why these areas are problematic, discuss current approaches, and illustrate alternative approaches that may lead to a more dependable system. Ultimately, designs should be tested against a comprehensive fault model, and a probabilistic analysis cannot be avoided.