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The cost of accomplishing work on a central computer facility— providing service to a large number of interactive users—has shifted, with the cost of the aggregate user time being the dominant component. Moreover, user costs are expected to continue to increase and system costs are expected to continue to decrease in the coming decade. This suggests that computer systems should be managed for maximum user effectiveness rather than for maximum machine usage.
A. J. Thadhani (Thu,) studied this question.