In this paper, the authors complete the summative stage of the validity argument approach, then use their experiences to reflect on the validity argument as a method. They begin by evaluating the inferences and assumptions of the interpretive argument for the MKT measures. Then they examine both the form and the structure of the interpretive argument for the MKT measures with an eye to generalizations that can be made to other efforts to construct interpretive arguments. Finally they attempt to draw some reasonable generalizations and conclusions concerning the summative stage.