Cognitive Behaviour Therapy is not an overnight process. Even after clients have learned to recognise when and where their mental processes go awry, it can take months of effort to replace a dysfunctional cognitive-affective-behavioral process or habit with a more reasonable, salutary one.

An example will illustrate the process: Having made a mistake, a person believes, “I’m useless and can’t do anything right.” This, in turn, worsens the mood, leading to feelings of depression; the problem may be worsened if the individual reacts by avoiding activities and then behaviorally confirming his negative belief to himself. As a result, a successful experience becomes more unlikely, which reinforces the original thought of being “useless.” In therapy, the latter example could be identified as a self-fulfilling prophecy or “problem cycle,” and the efforts of the therapist and client would be directed at working together to change this. This is done by addressing the way the client thinks and behaves in response to similar situations and by developing more flexible ways to think and respond, including reducing the avoidance of activities. If, as a result, the client escapes the negative thought patterns and destructive behaviors, the feelings of depression may, over time, be relieved. The client may then become more active, succeed more often, and further reduce feelings of depression.