“…As the focus of the evaluation is user experience, widely used and well-accepted usability heuristics proposed by Nielsen (1994Nielsen ( , 2005 and Nielsen and Molich (1990) were considered and are presented next: Lee and Price (2015) also summarized a list of different criteria that were used in previous literature on evaluating recommender systems (Herlocker, Konstan, Terveen, & Riedl, 2004;Knijnenburg, Willemsen, Gantner, Soncu, & Newell, 2012;Pu, Chen, & Hu, 2011;Zhang, Séaghdha, Quercia, & Jambor, 2012). As our task in GC14UX was about music discovery, we also considered the following criteria:…”