Cumulative Record. Chapter 28: The Operational Analysis of Psychological Terms. Quote 2

Operationism may be defined as the practice of talking about (1) one’s observations, (2) the manipulative and calculational procedures involved in making them, (3) the logical and mathematical steps which intervene between earlier and later statements, and (4) nothing else. So far, the major contribution has come from the fourth provision and, like it, is negative. (p. 416)