The music information retrieval community has long recognized the need for better evaluation. Frameworks as comprehensive as in the field of text retrieval are missing. An important problem of evaluation for music retrieval is the high cost. This work continues on the proposed low-cost evaluation model. The low-cost model allows for cheap evaluation with a degree of uncertainty. Alongside the evaluation results, confidence is indicated for interpretability. The confidence is however overconfident. This work breaks down the causes and introduces solutions that reduce this overconfidence. The evaluation results of certain metrics are structurally overestimated. The source of this problem is found and an appropriate solution is explained.

Video games have become increasingly more popular, but few focus on physical activity. VRabl, a multiplayer augmented reality sports game, stimulates players to be physically active, while providing similar aspects as video games. It is based on the well-known and popular game dodgeball to reach out to a large possible player community and have simple rules. The major goal of VRabl though is to make dodgeball more attractive and engaging for younger generations. The game relies on two Microsoft HoloLenses to enable a novel multiplayer augmented-reality sports game. A first evaluation shows that VRabl is enjoyable for people of every age group and stimulates physical activity, while having fun at the same time.