Dependable Computing for Critical Applications by Mel Barnes (auth.), Prof. Dr. Algirdas Avižienis, Dr.

By Mel Barnes (auth.), Prof. Dr. Algirdas Avižienis, Dr. Jean-Claude Laprie (eds.)

The foreign operating convention on in charge Computing for serious purposes was once the 1st convention prepared through IFIP operating staff 10. four "Dependable Computing and Fault Tolerance", in cooperation with the Technical Committee on Fault-Tolerant Computing of the IEEE laptop Society, and the Technical Committee 7 on structures Reliability, security and safety of EWlCS. the explanation for the operating convention is healthier expressed via the goals of WG 10. four: " more and more, members and agencies are constructing or buying subtle computing structures on whose prone they should position nice reliance. In differing situations, the point of interest might be on differing houses of such companies - e. g. continuity, functionality, real-time reaction, skill to prevent catastrophic disasters, prevention of planned privateness intrusions. The suggestion of dependability, outlined as that estate of a computing procedure which permits reliance to be justifiably put on the carrier it grants, permits those a variety of issues to be subsumed inside a unmarried conceptual framework. Dependability therefore comprises as exact situations such attributes as reliability, availability, safeguard, safeguard. The operating crew is aimed toward picking out and integrating techniques, equipment and methods for specifying, designing, development, assessing, validating, working and preserving computers which should still show a few or all of those attributes. " the idea that of WG 10. four was once formulated throughout the IFIP operating convention on trustworthy Computing and Fault Tolerance on September 27-29, 1979 in London, England, held along side the Europ-IFIP seventy nine convention. Profs A. Avi~ienis (UCLA, l. a., united states) and A.

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Definition. A criterion Ci is covered with probability QN (test quality wrt Cn if each element E SCi has a probability equal to or greater than QN to be exercised at least once during statistical test runs. o Let Pk be the probability that a random input exercises k E SCi. The number NCi of executions required to reach the coverage of criterion Ci with probability QN is given by equation 3 with p =min {Pk, k E Sci}. Software validation by means of statistical testing: retrospect and future direction 41 More generally, the notion of statistical coverage can be used for a set C of several criteria.

It indicates which of the six following cases is satisfied by A, B, C (see figure 2). • Path 1: they are not in nonincreasing order of their size. • Path 2: they are the sides of a right angled triangle. • Path 3: they are the sides of an isosceles triangle. • Path 4: they are the sides of an equilateral triangle. • Path 5: they are the sides of an obtuse angled triangle. • Path 6: they are the sides of an acute angled triangle. or. B=C T F Path 6 Figure 2. Flowchart of the program TRIANGL. Software validation by means of statistical testing: retrospect andjuture direction 43 The program contains a missing pathfault, noted fO thereafter: it does not check that the lengths satisfy the triangle inequality A < B+C.

The first two steps aim at revealing faults, and the third one provides an assessment of operational reliability. Future work to support the strategy is outlined. Thevenod-Fosse 24 1. Introduction Nowadays, software validation remains an acute problem in the area of computing systems dependability. It involves two notions, namely fault removal and fault forecasting [25]. Substantial work has already been done in both fields, which are often investigated separately and through distinct approaches.

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