The fact that a behavior can be instrumental for multiple goals does not logically entail that people are typically propelled into action for multiple reasons. On the contrary, goal-directed behavior in the real world is, in a given instance, aimed at one focal goal. In this article, I present the Campbell paradigm, in which a particular behavior is controlled by a single reason or goal. To identify the very reason (i.e.
Cognitive Behaviour Therapy has been demonstrated to be an effective intervention in outpatient and inpatient settings for a wide range of presenting mental health problems including depression, Obsessive Compulsive Disorder, Post traumatic Stress Disorder, Social Anxiety Disorder, Panic Disorder and Somatorform Disorder. There is likely to be an unmet need for this therapeutic approach in most Low and Middle Income Countries (LMIC).