2.1 A. Early psychometric heritage
Historical accounts of the evolution of the psychometric approach abound (e.g., see Brody, 2000 and Carroll, 1993; Horn & Noell, 1997).  Prior to 1930, the usual distinction in cognitive abilities was verbal and quanitative (Corno, Cronbach, Kupermintz, Lohman, Mandinach, Porteus, Talbert, & Cronbach, 2002).  Key early historical developments that ultimately lead to the emergence of CHC theory are listed in the first two sections of Table 1.  The lack of a detailed treatment (in this chapter) of all the developments in Table 1 is a necessary constraint and in no way diminishes the importance of each contribution. In addition, the major steps that lead to current day CHC theory are illustrated in Figure 1. In the next section, CHC theory is described as it evolved through a series of major theory-to-practice bridging events that occurred during the past two decades.  The goal is to establish an appropriate historical record of the events that transpired and the role that different individuals played in this process.