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Showing progress towards a goal is a well-established motivational design tactic. This paper describes how university students designed a new "progress meter" for an online learning game and then evaluated the effects of the design using a controlled online experiment, or A/B test. Using the UpGrade A/B testing platform, we randomly assigned 3,200...
UpGrade is an open-source tool for A/B testing in educational software. We this study, we used UpGrade to run large scale online experiments in an educational game. Our experiments were aimed at increasing the student engagement. We experimented with various features of the game such as question difficulty, game narrative, feedback style, etc. to f...