“…In the studies of technological persistence, competence accumulation is seen as a key feature of technological change, with a constraining impact on future search and learning processes (Dosi, 1982;Malerba et al, 1997;Cantwell and Vertova, 2004). Past achievements, patterns of problem-solving activities and accumulated competencies constrain current activities as well as directions in which new opportunities can be searched for (Dosi, 1982;Malerba et al, 1997;Patel and Pavitt, 1997) and new opportunities are therefore likely to be found close to areas of existing expertise (Teece et al, 1997). The result is a stable pattern of technological specialization within a company or an industry (Patel and Pavitt, 1997;Essletzbichler and Winther, 1999;Fai and von Tunzelmann, 2001;Fai, 2003).…”