“…US studies report conflicting results regarding the link between performance and strategic group membership (Cool, 1985;Cool and Schendel, 1987;Martens, 1988;Bogner, 1991;Bogner et al, 1996;Guedri, 1998). In the studies which have measured the aspects of strategic group performance in the pharmaceutical industry, a number of common points were identified (Cool, 1985;Cool andSchendel, 1987, 1988;Martens, 1988;Bogner, 1991;Voyer, 1993;Cool et al, 1994;Guedri, 1998;Suárez et al, 2011). First, in all cases, several relatively stable strategic groups were identified despite significant changes recorded over a given period of time.…”