Requirements Analysis of Variability Constraints in a Configurable Flight Software System

• URL: http://arxiv.org/abs/2309.03392v1
• Date: Wed, 6 Sep 2023 22:56:39 GMT
• Title: Requirements Analysis of Variability Constraints in a Configurable Flight Software System
• Authors: Chin Khor and Robyn Lutz
• Abstract summary: We report on our experience with the variability-related requirements constraints of a flight software framework used by multiple space missions. We propose a new software variability model, similar to a product-line feature model, in the flight software framework.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Variability constraints are an integral part of the requirements for a configurable system. The constraints specified in the requirements on the legal combinations of options define the space of potential valid configurations for the system-to-be. This paper reports on our experience with the variability-related requirements constraints of a flight software framework used by multiple space missions. A challenge that we saw for practitioners using the current framework, now open-sourced, is that the specifications of its variability-related requirements and constraints are dispersed across several documents, rather than being centralized in the software requirements specification. Such dispersion can contribute to misunderstandings of the side-effects of design choices, increased effort for developers, and bugs during operations. Based on our experience, we propose a new software variability model, similar to a product-line feature model, in the flight software framework. We describe the structured technique by which our model is developed, demonstrate its use, and evaluate it on a key service module of the flight software. Results show that our lightweight modeling technique helped find missing and inconsistent variability-related requirements and constraints. More generally, we suggest that a variability modeling technique such as this can be an efficient way for developers to centralize the specification and improve the analysis of dispersed variability-related requirements and constraints in other configurable systems.

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