ObjectiveAmong evidence-based treatments for personality disorder (PD), mentalization-based treatment (MBT) represents a manualized, long-term treatment. Both MBT and non-manualized psychotherapeutic treatments (NMT) are currently applied for patients with PDs in Norway. This clinical population is characterized by varying impairment of personality functioning (PF). Few have investigated how MBT and NMT are suited for the heterogeneity of personality problems presenting to health services and ho