In the space field, there is a large and growing need to estimate software dependability, which occupies an increasingly critical position within systems. Software dependability studies have several objectives: to know the level of dependability (in terms of reliability, availability or safety) attained by software when it is delivered to the customer (after the test phases); to know the dependability objectives to be assigned to the software, depending on its type and criticality; to know the factors influencing dependability and thus to control them during development so as to meet the objectives set; to monitor dependability evolution during the software operational phases (reliability and maintainability). The results presented here mainly concern the last aspect. The Centre National d'Etudes Spatiales (French National Center of Space Studies) uses an integrated environment for collecting and analyzing software reliability and quality data during the development or operational phases (1) (2). We recall its principal characteristics in section 2. We then describe how this environment is used in the qualification and operational phases of an actual project. The project, the data collected, and the collecting conditions are presented in section 3. The principal results provided by the analysis of data corresponding to four years' use of the software are summarized in section 4.
Software dependability evaluation in space systems
Softwareabhängigkeit in Raumfahrtsystemen
1990
5 Seiten, 5 Bilder, 1 Tabelle, 9 Quellen
Conference paper
English
Dependability evaluation of integrated hardware/software systems
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