“…In addition, although numerous studies pointing to a positive correlation between these systems and high task results of employees exist, there are still many unresolved issues, including, among others, the influence that HRM mechanisms exert on efficiency and effectiveness is insufficiently explained (Becker & Gerhart, 1996;Purcell, Kinnie, Hutchinson, Rayton, & Swart, 2003), no intervening variables are taken into account in analyses (Huselid & Becker, 1996), and the characteristic nature of service firms is disregarded -the majority of examinations are chiefly based on production companies, whereas some of their practices are inadequate for service firms (Fu, Flood, Bosak, Morris, & O'Regan, 2015). Hence the problems that have been indicated give rise to new research areas.…”