Identifying dependability requirements for space software systems

Abstract

Computer systems are increasingly used in space, whether in launch vehicles, satellites, ground support and payload systems. Software applications used in these systems have become more complex, mainly due to the high number of features to be met, thus contributing to a greater probability of hazards related to software faults. Therefore, it is fundamental that the specification activity of requirements have a decisive role in the effort of obtaining systems with high quality and safety standards. In critical systems like the embedded software of the Brazilian Satellite Launcher, ambiguity, non-completeness, and lack of good requirements can cause serious accidents with economic, material and human losses. One way to assure quality with safety, reliability and other dependability attributes may be the use of safety analysis techniques during the initial phases of the project in order to identify the most adequate dependability requirements to minimize possible fault or failure occurrences during the subsequent phases. This paper presents a structured software dependability requirements analysis process that uses system software requirement specifications and traditional safety analysis techniques. The main goal of the process is to help to identify a set of essential software dependability requirements which can be added to the software requirement previously specified for the system. The final results are more complete, consistent, and reliable specifications.

Front End Projects Benefits Realisation from a Requirements Management Perspective—A Systematic Literature Review

“…During the benefits realisation cycle, stakeholders often find need where their spaces have to be serviced or maintained. This review identifies increasing interest in lifecycle performance of processes such for serviceability, accessibility [84,85] and maintainability [86]. In particular, there are opportunities in integrated processes and standardisation [85], Sustainable and continuing performance in product-service systems [84], data security in the IT [48] all issues making lifecycle performance an important requirement category during design decision making.…”

ontoELICERE: Um Conjunto de Ontologias para Representar os Elementos de uma Análise de Perigos em Sistemas Aeroespaciais

“…Para se identificarem as medidas de mitigação, o sistema pode utilizar as bases de dados de atributos (ADB) e a base de conhecimentos (KB). A ADB foi criada utilizando-se trabalhos da literatura [13,14,15,16], que conduziram levantamentos de perigos, suas causas e suas possíveis mitigações. A KB foi construída por meio de medidas de mitigação utilizadas em projetos já analisados, permitindo o reuso de mitigações já adotadas.…”

Applying COCOMO II for a DO-178C Safety-Critical Software Effort Estimation

“…operate at an extremely high frequency and have strict response requirements in which a single fault can generate catastrophic events (McCormick et al 2011). Romani et al (2010) emphasize the importance of requirements for space soft ware systems according to the NASA criticality scale. A soft ware for such applications is generally developed following rigorous process standards.…”