The overall aim of this paper is to provide an epistemological rational for the measurement of intentionality. The purpose of this narrative is to identify "Intentionality" as an arena of action in the dispositional learning domain can be measured using an "Intentionality Measurement Instrument" [also referred by the acronym "IMI"] based upon a dual scalar model similar to the measurement of the correlation coefficient. The methodology of the "IMI" is to statistically test intentionality via specific psychometric instruments. The IMI as an educational science statistical metric has universal applicability and is ideally suited for measurement of purposive content (the subject matter area), purposive capability (the psychomotor domain), and purposive knowledge (the cognitive domain) based directly upon disposition (the affective domain-which determines the will, purpose, and reason behind the identified event). This methodology is a novel approach to much needed dispositional statistical data analysis. It adds considerable value to the methods designed to assess rationale and reason through specific instrument validity and reliability. A sequential computational methodology for IMI statistical analysis through a model is provided to clarity the metrics that are procedurally used in a step by step fashion that illustrates the entire process of intentionality inquiry.