Abstract
During the past decade, performance evaluation and reliability evaluation have emerged as important technical disciplines within computer science and engineering. Evaluations of computer performance and computer reliability are each concerned, in part, with the important question of computer system "effectiveness", i.e., the extent to which the user can expect to benefit from the tasks accomplished by a computer in its use environment. With regard to effectiveness issues, modelling of <u>computer performance</u> has stressed the need to represent the probabilistic nature of user demands (workload) and internal state behavior, under the assumption that the computer's structure is fixed, that is, there are no permanent changes in structure due to faults. On the other hand, modelling of <u>computer reliability</u> has stressed changes caused by transient and permanent faults of the computer. It has only been in some recent studies that reliability modelling has begun to account explicitly for the probabilistic nature of the use environment.
Published Version
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