SOBO: A Feedback Bot to Nudge Code Quality in Programming Courses

Abstract: Recent research has shown the great potential of automatic feedback in education. This paper presents SOBO, a bot we designed to automatically provide feedback on code quality to undergraduate students. SOBO has been deployed in a course at the KTH Royal Institute of Technology in Sweden with 130+ students. Overall, SOBO has analyzed 1687 GitHub repositories and produced 8443 tailored code quality feedback messages to students. The quantitative and qualitative results indicate that SOBO effectively nudges students into adopting code quality best practices without interfering with pedagogical objectives or adding a teaching burden. From this experience, we provide guidelines into how to design and deploy teaching bots in programming courses.