Toward requirements engineering of cyber-physical systems: Modeling CubeSat

The OpenOrbiter CubeSat Development Initiative is working to build a small spacecraft system using open source software and open hardware principles. The important design considerations for the CubeSat include availability and performance. The essential contribution of this paper is the requirement elicitation and specification of system-wide qualities such as availability, performance, and security using quality attribute scenarios. The effect of using the quality-based scenarios is that it allows more rigorous treatment of non-functional requirements and hence proper selection of an architecture modeling to satisfy these requirements.