In the course of Cybernetics of Cybernetics (CC), arises the problem of analyzing, for each student, three written texts from different moments during the course, searching for the distinctions, and their evolution throughout the course. PAST is a text analysis tool to help the professor in this “distinction discovering” in an impersonal and repeatable way. The process, based on professor-defined rules, consist in realizing successive text transformations that lead to a Conceptual Proximity Graph (CPG) reflecting the distinctions
