The general consensus from that research is that the MacCAT-T is good at detecting the presence of the four abilities as specified by the four-abilities model
At this point in time, the most widely used instrument is the MacCAT-T (Grisso, Appelbaum, & Hill-Fotouhi 1997). It reflects the most widely influential theory of competence to date, that of Grisso and Appelbaum (1998). At the core of this theory are the same four abilities mentioned in §4 of this entry: the ability to communicate a choice, the ability to understand, the ability to appreciate, and the ability to reason. However, Grisso and Appelbaum (1998) develop detailed specifications f