 Constructs are denoted by variables in a model that predicts which correlations would be observed among the indications of different measures if they are indeed measures of the same attribute. Such models involve substantive assumptions about the attribute, including its internal structure and its relations to other attributes, and statistical assumptions about the correlation among different measures (Campbell &amp; Fiske 1959; Nunnally &amp; Bernstein 1994: Ch. 3; Angner 2008).