Metrics for oversight of software supplier of safety-critical aerospace systems

• Autor(a) principal: Benedito Massayuki Sakugawa
• Data de Publicação: 2017
• Tipo de documento: Tese
• Idioma: eng
• Título da fonte: Biblioteca Digital de Teses e Dissertações do INPE
• Texto Completo: http://urlib.net/sid.inpe.br/mtc-m21b/2017/11.01.14.43

The current scenario shows a tendency to outsourcing space systems, and for managing presumed risk the oversight (supervision) of supplier increases in importance by identifying problems and nonconformities at earlier stages. Moreover, particularly for software the civil aviation performs some oversight-like activities (informally called audits) for certification purpose, but the criteria used for classifying the issues are not adequate for evaluating the audit result, and may mislead the management decision. The above scenario added by the proximity between space and aviation, gives opportunity to creating a mechanism able to capture the audit result, which can be used with confidence for management decision. This work presents metrics for oversight of software supplier of safety-critical aerospace system, called Aerospace Metrics. The purpose of the Aerospace Metrics is to evaluate the oversight results for supporting management decision. The metrics are generated analytically by using the Goal- Question Metric (GQM) technique combined with the Reasons human error model. A survey is performed with software safety specialists from the civil aviation to providing additional information for metrics adjustment and evaluation. For evaluation in aeronautics, the generated metrics are applied to selected cases of aviation software audits, and evaluated against the related software certification history. For evaluation in astronautics, software safety systematic comparison between space and aviation is performed to identifying adjustments in the metrics and the oversight activities, due to space specific necessities. As case study, the adjusted oversight activities are applied to a space project called QSEE (Quality of Software Embedded in Space Applications), and the results are submitted to the metrics for evaluation. The work produced acceptable results, showing that the Aerospace Metrics are feasible, and can be applied to either aeronautics or astronautics with few adjustments due to specific necessities.