The personality assessment system: A radical hypothesis

Two stories are presented. The first story is about a clinical practitioner developing an assessment method beginning with a connection of test “signs” with behavior, and proceeding to a system that could mystify observers. The second story is about the application of scientific methods to explain how the system could work. Together the stories are an example of practice informing science, and science informing practice. The basic hypothesis used is that much of what we call personality is “caused” by differential aptitudes as modified by long-term learning. It is also assumed that people would prefer to use those aptitudes they feel are their better ones and avoid those in which they feel weaker.