Istituto di Scienza e Tecnologie dell'Informazione     
Di Giandomenico F., Strigini L. Adjudicators for diverse redundant components. In: 9th Symposium on Reliable Distributed Systems. (Huntsville, Alabama, USA, October 9-11 1990). Proceedings, pp. 114 - 123. IEEE, 1990.
In fault tolerant components realized using replication, several alternate results are produced, from which a single correct result must be derived. This is done by a mechanism, that we call an adjudicator (a concept more general than a voter), which uses as its inputs the individual results produced by the replicated subcomponents comprising the redundant component. This paper gives a rigourous definition of the adjudication problem, summarizes the existing literature on the topic, and investigates the use of probabilistic knowledge about errors/faults in the subcomponents of a fault tolerant component to obtain good adjudication functions. The concept of an optimal adjudicator is introduced and discussed.

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