Developmental studies have primarily focused on what takes place within the confines of a given interpersonal system (first order development). What has been neglected is second order development, the interpersonal communication that alters the system itself. From this particular developmental perspective, a model can be used that illustrates and gives meaning to the complicated steps involved in the movement from security to alienation in a relationship. This technique can be used with a person whose conception of a relationship has changed radically. In a case study of a 19-year-old sophomore at a large state university application of the model provided evidence that second order development (1) follows a predictable pattern, (2) is marked by personal struggle, (3) has outcomes oblique to what is happening, and (4) involves risk. (HOD)