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Overall, the philosophy is to attack the availability problem from two complementary directions: to reduce the number of software errors through rigorous testing of running systems, and to reduce the effect of the remaining errors by providing for recovery from them. An interesting footnote to this design is that now a system failure can usually be considered to be the result of two program errors: the first, in the program that started the problem; the second, in the recovery routine that could not protect the system. -- A. L. Scherr, "Functional Structure of IBM Virtual Storage Operating Systems, Part II: OS/VS-2 Concepts and Philosophies," IBM Systems Journal, Vol. 12, No. 4, xxxx, pp. 382-400