“…PBLAs cover a wide range of educational activities regarding every school subject and almost all aspects of human activity and communication, e.g., environmental issues, cultural and social life (civilization, arts, human relations, individual or ethnic or other group identities), multidimensional aspects and problems of everyday life (health, science, research, history, technology, communication) and so on (Cohen, et al, 2004;Gillies, 2007;Gray & Larson, 2008; Kaldi et al, 2011). Despite PBLAs' almost borderless scope of interest, all of them are considered to contribute to the display of high-ranked cognitive, meta-cognitive, emotional, and social skills, to capture students' interest, and excite their imagination, initiative, and creativity in a framework where students are co-educated as members of larger groups and receive, at the same time, individualised support and assistance in order to effectively meet personal, group and social requirements (Newell, 2003;Polman, 2000;Railsback, 2002).…”