Kaluzny, Veney and Gentry (1972) define radical innovations in terms of risk. Since the radical incremental distinction is one of the perceived degree of new knowledge embodied in the technology, managers are likely to differ in their judgment of an innovation based on their level of familiarity and experience. Furthermore, innovations change their classifications over time, e.g., steam locomotives were once thought quite novel, but today, unfortunately, they are mere historical curiosities