“…In this respect, most studies indicate that time is a positive factor in the appearance of the beneficial effects we have mentioned, which are caused by adhering to ISO 9001 (Romano, 2000;Climent, 2005;Corbett et al, 2005). Nonetheless, it is also possible to find studies that maintain the opposite (Tsiotras y Gotzamani, 1996;Jones et al, 1997;Leung et al, 1999;Casadesús et al, 2004;Gotzamani et al, 2006), which seems to indicate that the time factor may be conditioned by the sector under observation and/or the type of internal or external positive effect being analysed.…”