%0 Conference Paper %1 wang2017exploratory %A Wang, Yang %A Ramadani, Jasmin %A Wagner, Stefan %B PROFES 2017: Product-Focused Software Process Improvement %D 2017 %I Springer %K iste-se myown safety-analysis stamp %P 324-340 %T An Exploratory Study on Applying a Scrum Development Process for Safety-Critical Systems %V 10611 %X Background: Agile techniques recently have received attention from the developers of safety-critical systems. However, a lack of empirical knowledge of performing safety assurance techniques, especially safety analysis in a real agile project hampers further steps. Aims: In this article, we aim at (1) understanding and optimizing the S-Scrum development process, a Scrum extension with the integration of a systems theory based safety analysis technique, STPA (System-Theoretic Process Analysis), for safety-critical systems; (2) validating the Optimized S-Scrum development process further. Method: We conducted a two-stage exploratory case study in a student project at the University of Stuttgart, Germany. Results: The results in stage 1 showed that S-Scrum helps to ensure safety of each release but is less agile than the normal Scrum. We explored six challenges on: priority management; communication; time pressure on determining safety requirements; safety planning; time to perform upfront planning; and safety requirements’ acceptance criteria. During stage 2, the safety and agility have been improved after the optimizations, including an internal and an external safety expert; pre-planning meeting; regular safety meeting; an agile safety plan; and improved safety epics and safety stories. We have also gained valuable suggestions from industry, but the generalization problem due to the specific context is still unsolved.

@inproceedings{wang2017exploratory, abstract = {Background: Agile techniques recently have received attention from the developers of safety-critical systems. However, a lack of empirical knowledge of performing safety assurance techniques, especially safety analysis in a real agile project hampers further steps. Aims: In this article, we aim at (1) understanding and optimizing the S-Scrum development process, a Scrum extension with the integration of a systems theory based safety analysis technique, STPA (System-Theoretic Process Analysis), for safety-critical systems; (2) validating the Optimized S-Scrum development process further. Method: We conducted a two-stage exploratory case study in a student project at the University of Stuttgart, Germany. Results: The results in stage 1 showed that S-Scrum helps to ensure safety of each release but is less agile than the normal Scrum. We explored six challenges on: priority management; communication; time pressure on determining safety requirements; safety planning; time to perform upfront planning; and safety requirements’ acceptance criteria. During stage 2, the safety and agility have been improved after the optimizations, including an internal and an external safety expert; pre-planning meeting; regular safety meeting; an agile safety plan; and improved safety epics and safety stories. We have also gained valuable suggestions from industry, but the generalization problem due to the specific context is still unsolved.}, added-at = {2018-07-16T14:19:55.000+0200}, author = {Wang, Yang and Ramadani, Jasmin and Wagner, Stefan}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/27ca3347f2e710f47ee8eb7587a3d701d/wagnerst}, booktitle = {PROFES 2017: Product-Focused Software Process Improvement}, interhash = {cabb8c8172c4a262faa988454955c4ce}, intrahash = {7ca3347f2e710f47ee8eb7587a3d701d}, keywords = {iste-se myown safety-analysis stamp}, pages = {324-340}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, timestamp = {2021-02-19T09:10:29.000+0100}, title = {An Exploratory Study on Applying a Scrum Development Process for Safety-Critical Systems}, volume = 10611, year = 2017 }