Functional Analytic Psychotherapy (FAP)

Core ideas

1. The therapy session is the principal context of change

   FAP holds that the therapeutic relationship is not merely a facilitating means but the central laboratory in which the client's interpersonal patterns appear and are transformed. Relational difficulties are not analysed narratively alone; they are evoked and modified live within the therapist–client interaction. Change occurs when the real interpersonal contingencies in session alter the client's behavioural repertoire. (Kohlenberg & Tsai, 1991).

2. Clinically Relevant Behaviours organise the intervention

   The model distinguishes between CRB1 (problem behaviours in session), CRB2 (improvements in session) and CRB3 (verbal functional analysis of one's own behaviour), establishing that intervention should focus on discriminating, evoking and reinforcing these behaviours. This classification turns the session into a context of contingent interpersonal learning, guided by behavioural principles rather than by intrapsychic interpretation. (Kohlenberg & Tsai, 1991; Tsai et al., 2009).

3. Change is produced by direct interpersonal learning

   FAP emphasises that cognitive insight is not sufficient to modify entrenched relational repertoires; change occurs when the client experiences new interpersonal consequences within the session. The natural differential reinforcement of adaptive behaviours generates experiential learning that can be generalised to other contexts. (Kohlenberg & Tsai, 1991).

4. The therapist's authenticity is a clinical instrument

   The FAP therapist does not adopt a distant, neutral position, but uses their own emotional and behavioural experience as a deliberate therapeutic tool. Authenticity, functional vulnerability and genuine emotional response are part of the system of contingencies that shapes new ways of relating. (Tsai et al., 2009).

5. Functional analysis is continuous and contextual

   Clinical understanding in FAP is based on the functional analysis of behaviour in context, identifying antecedents, behaviour and consequences within the present interaction. This analysis is dynamic and in real time, avoiding explanations based on traits or static constructs of the self. (Kohlenberg & Tsai, 1991).

6. Reinforced vulnerability generates relational reorganisation

   FAP holds that the direct expression of primary emotions, especially those associated with shame or fear of rejection, constitutes a core of change. When vulnerability is differentially reinforced in a safe context, interpersonal expectations are reorganised and previous avoidant or defensive patterns are weakened. (Tsai et al., 2009).

7. Generalisation is an explicit criterion of effectiveness

   Therapeutic success in FAP is defined not solely by change in session, but by the observable transfer of new interpersonal repertoires to everyday life. The intervention includes deliberate planning to facilitate the generalisation of CRB2 outside the therapeutic context. (Kohlenberg & Tsai, 1991).

8. The alliance is contingent, not merely affective

   In FAP, the therapeutic alliance is conceived not solely as a positive emotional bond, but as a system of active contingencies in which reinforcement, evocation and modelling are constantly at work. The quality of the relationship is defined by its capacity to shape adaptive behaviours in real time. (Tsai et al., 2009).

Influences

• Radical behaviourism
• Functional analysis
• Functional contextualism (Hayes)
• Behavioural therapy

Key references

• Kohlenberg, R. J., & Tsai, M. (1991). Functional Analytic Psychotherapy.
• Tsai, M., Kohlenberg, R. J., Kanter, J. W., et al. (2009). A Guide to Functional Analytic Psychotherapy.