High Quality Content by WIKIPEDIA articles! Construct theory (PCT) is a psychological theory of human cognition. Eddington said, "Science is the attempt to set in order the facts of experience." George Kelly, the psychologist and creator of personal construct theory, utilized this idea. He inferred that psychology as a science was an attempt to set in order the facts of human experience so that the psychologist could make good predictions about what people will do when confronted by new situations.