“…It is worth noting the significant weight of documents that propose new models, systems or methods when compared with the number of studies based on empirical data. (Campos and Soares, 2014;Costa et al, 2010;Dias and Rafael, 2007;do Nascimento et al, 2005;Filho and Ribeiro, 2014;Gaaloul et al, 2014;Gomes et al, 2011Gomes et al, , 2012Gomes and Ribeiro, 2009;Irani et al, 2010;Luján-Mora and Masri, 2012;Maciel et al, 2009a;Marques et al, 2011Marques et al, , 2012Marques et al, , 2013Olmstead et al, 2007;Pedrosa et al, 2013;Rodrigues et al, 2010a;Sanz et al, 2010;Tavares and Oliveira, 2014;Tavares, 2008;Tavares and Silva, 2006;Teixeira et al, 2014;Vieira et al, 2011) Case study 13 19 (Aveiro and Pinto, 2013;Becker et al, 2011;Dias and Narciso, 2010;Maciel et al, 2009bMaciel et al, , 2010Pinto and Aveiro, 2014;Rocha and Sá, 2014;Rosa et al, 2013;Rocha, 2012, 2013;Santos et al, 2013;Tsaravas and Themistocleous, 2011) Content analysis 9 13 (Aleixo et al, 2012;Dias and Costa, 2013;Dias and Gomes, 2014;…”