Inventory Development
 Factorial Validity


One means of establishing the construct validity of any instrument is to establish its factorial validity. The purpose of factor analysis is "to examine empirically the interrelationships among the items and to identify clusters of items that share sufficient variation to identify their existence as a factor or construct to be measured by the instrument" (Gable, 1986, p. 85). Thus, if there are factors underlying the data collected from different teacher samples, these would become evident using factor analytic techniques.