“…Glaser & Strauss, 1967;Höffling, 2002). More specifically, a multiple case-study design was used, which focuses on understanding the dynamics present within single settings (Eisenhardt, 1989;Herriott & Firestone, 1983;Yin, 1989) in order to generate theory in the shape of propositions (Gersick, 1988;Harris & Sutton, 1986). This method is fitting when not much is known about the phenomenon that is being researched, or when the phenomenon is so complex that neither the variables nor the exact relationship between the variables is fully definable (van Hoesel, 1985), as is the situation here.…”