BackgroundIn the continuing revision of Diagnostic and Statistical Manual (DSM-V) “identity” is integrated as a central diagnostic criterion for personality disorders (self-related personality functioning). According to Kernberg, identity diffusion is one of the core elements of borderline personality organization. As there is no elaborated self-rating inventory to assess identity development in healthy and disturbed adolescents, we developed the AIDA (Assessment of Identity Development in Adolescence) questionnaire to assess this complex dimension, varying from “Identity Integration” to “Identity Diffusion”, in a broad and substructured way and evaluated its psychometric properties in a mixed school and clinical sample.MethodsTest construction was deductive, referring to psychodynamic as well as social-cognitive theories, and led to a special item pool, with consideration for clarity and ease of comprehension. Participants were 305 students aged 12–18 attending a public school and 52 adolescent psychiatric inpatients and outpatients with diagnoses of personality disorders (N = 20) or other mental disorders (N = 32). Convergent validity was evaluated by covariations with personality development (JTCI 12–18 R scales), criterion validity by differences in identity development (AIDA scales) between patients and controls.ResultsAIDA showed excellent total score (Diffusion: α = .94), scale (Discontinuity: α = .86; Incoherence: α = .92) and subscale (α = .73-.86) reliabilities. High levels of Discontinuity and Incoherence were associated with low levels in Self Directedness, an indicator of maladaptive personality functioning. Both AIDA scales were significantly different between PD-patients and controls with remarkable effect sizes (d) of 2.17 and 1.94 standard deviations.ConclusionAIDA is a reliable and valid instrument to assess normal and disturbed identity in adolescents. Studies for further validation and for obtaining population norms are in progress and may provide insight in the relevant aspects of identity development in differentiating specific psychopathology and therapeutic focus and outcome.

BackgroundIn the revision of the Diagnostic and Statistical Manual (DSM-5), “Identity” is an essential diagnostic criterion for personality disorders (self-related personality functioning) in the alternative approach to the diagnosis of personality disorders in Section III of DSM-5. Integrating a broad range of established identity concepts, AIDA (Assessment of Identity Development in Adolescence) is a new questionnaire to assess pathology-related identity development in healthy and disturbed adolescents aged 12 to 18 years. Aim of the present study is to investigate differences in identity development between adolescents with different psychiatric diagnoses.MethodsParticipants were 86 adolescent psychiatric in- and outpatients aged 12 to 18 years. The test set includes the questionnaire AIDA and two semi-structured psychiatric interviews (SCID-II, K-DIPS). The patients were assigned to three diagnostic groups (personality disorders, internalizing disorders, externalizing disorders). Differences were analyzed by multivariate analysis of variance MANOVA.ResultsIn line with our hypotheses, patients with personality disorders showed the highest scores in all AIDA scales with T>70. Patients with externalizing disorders showed scores in an average range compared to population norms, while patients with internalizing disorders lay in between with scores around T=60. The AIDA total score was highly significant between the groups with a remarkable effect size of f= 0.44.ConclusionImpairment of identity development differs between adolescent patients with different forms of mental disorders. The AIDA questionnaire is able to discriminate between these groups. This may help to improve assessment and treatment of adolescents with severe psychiatric problems.

Personality disorders can be seen as patterns of maladaptive personality traits that have their onset during childhood or adolescence and that have an impact on the individual throughout the life span. Identity disturbance is seen as the central construct for detecting severe personality pathology-and, most notably, borderline personality disorder-in adults and adolescents. Therefore, in the revision of the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, the construct of "identity" has been integrated as a core diagnostic criterion for personality disorders.One of the most central tasks of normal adolescent development is the consolidation of identity. Crises in the development of identity usually resolve into a normal and consolidated identity with flexible and adaptive functioning. By contrast, identity diffusion is viewed as a lack of integration of the concept of the self and significant others; it is also seen as the basis for subsequent personality pathology, including that of borderline personality disorder, which leads to a broad spectrum of maladaptive and dysfunctional behaviors.To measure identity pathology and its improvement with treatment, we developed a self-report questionnaire entitled Assessment of Identity Development in Adolescence to establish a reliable, valid, and time-efficient inventory to represent a dimensional concept of healthy and impaired personality development. The reliability of this self-report questionnaire is excellent, and the total score differentiated significantly between controls and patients with personality disorders. Adolescent Identity Treatment is a treatment model that focuses on identity pathology as the core characteristic of personality disorders. This model integrates specific techniques for the treatment of adolescent personality pathology on the background of object-relation theories and modified elements of Transference-Focused Psychotherapy. Moreover, psychoeducation, behavior-oriented home plans, and family work support the therapeutic process of the adolescent.

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