Journal of The Japanese Society for Quality Control

Measuring various characteristics have been studied to estimate and control software project and software itself. Software complexity is one of those characteristics, and various complexity metrics have often been used to estimate software reliability. However, most of complexity metrics ever proposed are used independently except for metrics proposed by Hanata, et al. In this paper, we report the results of analysis of the relationships between various complexity metrics and fault density which is considered to be a substitutional metric for software reliability. Among the complexity metrics, metrics in terms of programming style are included in addition to the metrics ever proposed such as those in terms of control structure. Each correlation coefficient were examined whether each complexity metric may be effective to predict fault density. We also show a guideline of most suitable values of these effective metrics for decreasing fault density. Finally, a compound metric which can predict the fault density of a software at delivery is proposed.

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According to the specification of traceability in ISO 9000 series, the suppliers shall establish the procedure to calibrate all measuring and test equipments that can affect product quality, having a known relationship to nationally recognized standards, and shall effectively implement the system and assure it. The recent rapid progress in the technology of electronics and sensing makes suppliers extend the covering area of equipment's calibration to a lower (nearer to the production processes) equipment and settle their optimal calibration procedure in continual style. The authors show that Kalman-filter can be applied effectively to this problem, as a system to be settled as procedures. The authors also show some examples of this applications and enumerate several points that must be aware of in this application.

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K. Ishikawa stated in his book "Japanese Quality Control" that 6 items including Quality First signified "a revolution in management philosophy". By correlating those 6 items with the conditions which he pointed out existed in their background, this paper addresses the matter as a problem in business administration. Its result indicates that there have come up the following 4 moot points with great importance and profound significance in modern days. First, the purpose of an enterprise lies not in profit-making but in good-furnishing due to innovation. Second, against the evils of virtical management common to the U. S. and Japan, though different in their history, and enterprise is required to start with the research of cross-functional management and proceed to that of the so-called horizontal management-centered structur parallel to production processes. Third, with Taylorism denied, an enterprise should make it an official duty for its QC circles to undertake Fine Engineering. Fourth, such a U. S.-type marcket priority system as seen in lay-off or procurement is not a desirable one. Enterprise behavior aiming at accumulation and continuity shold be taken.

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