“…Its roots lie in the work of Abernathy and his collaboration with my colleague Jim Utterback. Over the ensuing years a rich collection of empirical studies, conceptual frameworks, and quantitative models of innovation were developed (e.g., Abernathy, 1978;Abernathy and Utterback, 1978;Abernathy and Clark, 1985;Tushman and Anderson, 1986;Henderson and Clark, 1990;Klepper and Graddy, 1990;Utterback and Suarez, 1993;Utterback, 1994;Milling, 1996;Christensen, 1997;Pistorius and Utterback, 1997;Christensen et al, 1998;Utterback and Afuah, 1998;Christensen and Overdorf, 2000;Milling, 2001). …”