“…Models consider elapsed time (Gruber, 1992;Towill, 1985), number of units produced (Gruber, 1992;Argote and Epple, 1990;Towill, 1985;Yelle, 1979) and investment (Lieberman, 1984) as independent variables. The corresponding dependent variables offered have been price (Chung, 2001), cost (Waring, 1991;Argote and Epple, 1990;Fauber, 1989;Camm et al, 1987), output (Yelle, 1979;Lieberman, 1984), yield (Chung, 2001;Gruber, 1994;Mody and Wheeler, 1987), labor required (Dompere and Nti, 1991;Gerchak and Parlar, 1990;Boucher, 1987;Roser and Sundby, 1985;Yelle, 1979;Liao and Noftsinger, 1977;Wright, 1936), or some other input (Dorroh et al, 1986). There has been a general agreement on the use of a power model (1) (Smunt, 1986a;Kantor and Zangwill, 1991) to establish the rate of learning.…”