Confirmatory Factor Analysis (CFA) is conducted after the researcher has gained substantial knowledge about the latent variables (s)he wishes to study.
Convergent validity is a subset of construct validity. Here, the researcher’s aim is to find out whether the items he claims are measuring a particular construct are indeed measuring them.
According to Gefen and Straub (2005), “discriminant validity is shown when each measurement item correlates weakly with another construct excepts for the ones to which it is theoretically associated”.
Unlike the measurement models which deals with the relationship between a latent variable and its indicators, the defines the relationship between the various constructs in a model.