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Reprinted from the AFIPS Conference Proceedings, Vol. 30 (Atlantic City, N.J., Apr. 18-20), AFIPS Press, Reston, Va., 1967, pp. 483-485, when Dr. Amdahl was at International Business Machines Corporation, Sunnyvale,California. This influential article by Dr. Amdahl demonstrated the validity of the single processor approach, based on statistical characteristics of computation on computers from the mid 1950's - 60's and upon the operational requirements within problems of physical interest.