Using Scrum to Develop a Formal Model - An Experience Report.

The benefits of merging agile and formal methodologies have been discussed on the conceptual level for several years now, also in our previous work. This paper presents a hands-on investigation on the synergy of the Event-B formal method within the Scrum development process. A case study of the landing gear critical system is used to investigate the feasibility of such a merge. We provide the quantitative and qualitative analysis of the case study by measuring developer’s effort, size and complexity of the created model, as well as observing the development process. Our results show that the merge increases quality, in terms of sustaining the creation of correct and reliable systems (Event-B) and at the same time smoothens the modelling process, enhances comprehension of the system domain and requirements (Scrum).