In this paper, the authors develop a model of psychoanalytic clinical reasoning as the inferential process by which analytic therapists are able to arrive at an understanding of the clinical material. Starting from Bion's theory of functions, the authors propose that a "function" can be thought of as a condition-action sequence that analytic therapists implicitly use to respond to certain configurations of elements in the material by executing conceptual or reflective operations. To investigate the main families of functions that are used by analytic therapists in everyday practice, the authors used an interpersonal process recall procedure based on supervision sessions from a theoretically heterogeneous group of participants. A consensual procedure was developed to identify operations, spell out the underlying functions, and group functions into families. Twelve families of functions were identified that appear to be used by analytic therapists regardless of their schools of thought. The authors call them the "operators" of psychoanalytic clinical reasoning. According to the operators model, the process of psychoanalytic clinical reasoning consists in the chaining together of operations using functions from different families. A specific collection of "clinical reasoning styles" seems to be interwoven in this process. Different avenues open up for research, clinical practice, and training.
Keywords: case conceptualization; clinical reasoning; knowledge; psychoanalysis; reflective practice; reflexivity.