One key hallmark of the all of the several natural sciences and their experiments covered in SPT are quantities. This is why we call them the “empirical” disciplines. They measure aspects of the phenomena they study. The relate these measures in formula or use them to predict future states. Identification of components and their characterization in numbers is essential to science and one of its major products. Engineers need and use these measurables in their praxis.

As SPT workers go through the voluminous source science literature they will capture measurables for both Isomorphic Systems Processes and Linkage Propositions (ISPs & LPs).

We sometimes combine “measurables” with Identifying Features. We do this because typical measures are often typical of individual isomorphic processes. For example, the periodicity, or frequency of an oscillation is both a measure and a Identifying Feature of that type of Cycles and Cycling.