USeR: A Web-based User Story eReviewer for Assisted Quality Optimizations

User stories are widely applied for conveying requirements within agile software development teams. Multiple user story quality guidelines exist, but authors like Product Owners in industry projects frequently fail to write high-quality user stories. This situation is exacerbated by the lack of tools for assessing user story quality. In this paper, we propose User Story eReviewer (USeR) a web-based tool that allows authors to determine and optimize user story quality. For developing USeR, we collected 77 potential quality metrics through literature review, practitioner sessions, and research group meetings and refined these to 34 applicable metrics through expert sessions. Finally, we derived algorithms for eight prioritized metrics using a literature review and research group meetings and implemented them with plain code and machine learning techniques. USeR offers a RESTful API and user interface for instant, consistent, and explainable user feedback supporting fast and easy quality optimizations. It has been empirically evaluated with an expert study using 100 user stories and four experts from two real-world agile software projects in the automotive and health sectors.