Case-based stories for traceability education and training

The purpose of this paper is to disseminate knowledge about proven techniques relevant to software and systems engineering, and in particular to requirements traceability, but derived from another industry and another professional approach. It describes the process of investigating and dealing with an outbreak of a foodborne disease, an established process that depends upon traceability practice at multiple levels and its alignment within two distinct disciplines. We tell a story based upon an outbreak investigation case study to step through the details of this process and to discuss parallels for the practice of traceability in the context of identifying and addressing requirements-borne problems. Not only is this process a model of industrial practice in these other two disciplines, the provision of case study materials based upon past events is also a model industrial practice that makes the details of the process widely accessible for education and training. This paper seeks to encourage the similar use of case studies in requirements engineering education and training, to develop realistically grounded stories that can be used to step through the investigation of a requirements-borne problem, and so to demonstrate and discuss the practice and value of requirements traceability at each step.