Symptoms and Selected Therapeutic Interventions for Stabilisation
Borderline Personality Disorder is, at its core, a disorder of relationship. Its defining features — abandonment fear, cycles of idealisation and devaluation, emotional dysregulation — do not exist only within individuals but erupt in the space between people. This thesis takes that relational premise seriously and follows it into clinical practice.
Drawing on Linehan's biosocial model, attachment theory, and qualitative interviews with practitioners across German inpatient and outpatient settings, the thesis examines both how BPD manifests relationally and which therapeutic approaches — particularly DBT and family-inclusive interventions — practitioners find most stabilising.
The question that animates this thesis came from practice. During my internship at a social psychiatric support service, I kept returning to the same observation: clients with BPD described their relationships as simultaneously their greatest source of meaning and their most acute source of pain. Connection was not peripheral to their suffering — it was the terrain where suffering lived.
What struck me was how the clinical literature, for all its sophistication, often treated relational dynamics as secondary to the cataloguing of symptoms. This thesis attempts to reverse that order — to ask not just what BPD looks like, but how it is lived in relationship, and what practitioners can actually do to help.
BPD is classified in the ICD-10 as Emotionally Unstable Personality Disorder and in the DSM-5 under nine criteria — including frantic efforts to avoid abandonment, identity disturbance, impulsivity, recurrent self-harm, and affective instability. Comorbidities are the norm: depression, PTSD, substance use, and anxiety co-occur at high rates, complicating diagnosis and demanding comprehensive treatment.
Linehan's biosocial model proposes that BPD emerges from the interaction of a biological predisposition toward emotional sensitivity and a developmentally invalidating environment — one that repeatedly communicates that the child's emotional experience is wrong or exaggerated. The model is deeply compassionate: BPD is not a character flaw but an understandable response to a particular combination of nature and experience.
Adults with BPD most commonly display disorganised or anxious-preoccupied attachment — simultaneously hungry for closeness and terrified by it. The phenomenon of splitting — experiencing others as wholly good or wholly bad, without ambivalence — is not a cognitive distortion but a survival strategy, one that made developmental sense when early caregiving was unpredictable or frightening.
DBT, developed by Linehan in the 1980s, remains the gold-standard evidence-based treatment for BPD. Its central dialectic — radical acceptance alongside the necessity of change — is itself a relational stance. The four skills modules (mindfulness, distress tolerance, emotion regulation, interpersonal effectiveness) each have direct applications to relational functioning, with the interpersonal effectiveness module most directly targeting the patterns this thesis examines.
For clients whose relational template is one of unpredictability and danger, experiencing a boundaried, consistent, honest professional relationship is not merely the container for treatment — it is the treatment. Transference phenomena are especially intense in BPD work; how the client relates to the therapist is therapeutic material, not just its context.
BPD does not affect only the individual. Partners, parents, and siblings experience secondary trauma, grief, and burnout. The Family Connections Programme — a twelve-session DBT-based psychoeducational intervention — provides family members with skills, validation, and community. This thesis argues for its wider integration into German social work practice.
The empirical component uses semi-structured expert interviews with social workers and therapists who have direct clinical experience with BPD clients across German inpatient and outpatient settings. Participants were selected through purposive sampling for expertise and institutional diversity.
Interviews were transcribed verbatim and analysed using Mayring's qualitative content analysis — a systematic approach moving inductively from raw text through structured coding to interpretive category formation. Researcher reflexivity was attended to throughout: my positioning as a social work student with internship experience in a social psychiatric setting was acknowledged as both resource and potential bias.
Analysis produced categories across four domains: the relational symptom picture practitioners observe; clients' social relationships outside the clinical encounter; the therapeutic relationship itself; and the structural context of BPD care in Germany.
Validation emerged as the prerequisite for everything else — clients needed to experience genuine understanding before skills-based work could take root. The transference relationship was both the primary challenge and, for skilled practitioners, the primary vehicle of change. Structurally, practitioners identified significant gaps: insufficient DBT-trained professionals, underdeveloped aftercare pathways, and almost no systemic family support provision.
BPD is a relational disorder and its treatment must be relational in kind — attending not only to evidence-based techniques but to the quality of the therapeutic relationship, how it is managed, and what it can model. The treatment frame must also expand beyond the individual to the people around them.
Practical recommendations include expanded DBT training for social workers, formal integration of family support programmes like Family Connections into standard BPD care, and community-based relational support that can sustain clients between clinical contacts. These are achievable changes. They require will, not magic.