“…To date, there are twenty-nine works that provide an explicit definition of quality; of these, only nine works have an associated validation procedure (Challenger et al, 2015;Espinilla et al, 2011;Grobshtein and Dori, 2011;Hindawi et al, 2009;Lange and Chaudron, 2005;Le Pallec and Dupuy-Chessa, 2013;López-Fernández et al, 2014;Maes and Poels, 2007;Merilinna, 2005). Using the classification of evaluation techniques that were previously proposed in (Siau and Rossi, 1998) on the nine identified works, we found five works that reported laboratory experiments, two works that used metrics, and other individual works that used survey, metamodelling, and case studies.…”