During the past few years, there has been considerable growth in the practice of modeling automotive software requirements. Much of this growth has been centered on software requirements and its value in the context of specific functional areas of an automobile, such as powertrain, chassis, body, safety and infotainment systems. This paper makes a case for modeling four cross-functional attributes of software, namely security, privacy, usability, and reliability, or SPUR. These attributes are becoming increasingly important as automobiles become information conduits. We outline why these SPUR attributes are important in creating specifications for embedded in-vehicle automotive software.
Several real-world use-cases are reviewed to illustrate both consumer needs and system requirements — functional and non-functional system requirements. From these requirements the underlying architectural elements of automotive SPUR are also derived. Broadly speaking these elements span three software service domains: the off-board enterprise software domain, the nomadic (device or service) software domain and the embedded (in-vehicle) software domain, all of which need to work in tandem for the complete lifecycle management of automotive software.