“…Quantitative measures of constructs have been used in psychometrics, to measure psychological attributes and aptitudes (see, for example, Patterson, 1990); in education, to measure educational achievement and ability (see, for example, Forsythe et al, 1986); in public health, to measure variables such as cognitive health (see, for example, Wallace and Herzog, 1995); in public administration, to measure public service motivation (see, for example, Perry, 1996); in economics, to measure contingent valuation and averting costs (see, for example, Laughland et al, 1996); and in political science and sociology to measure concepts of governance such as democracy, corruption, and political attitudes and perceptions (see, for example, Faber, 1987;Elkins, 2000;Johnston, 2000). All of these have been concerned with the issue of construct validity: the question of whether the measures in fact measure what they claim.…”