Abstract: Traditionally training and service planning in mental health were focused on Psychosis, Affective and Neurotic disorders. Recently Personality disorders represent a significant portion ofclinicians' caseload and Mental Health services need to meet their needs. Aim: 1. To examine the adult mental health clinicians' experience while working with individuals diagnosed with Borderline Personality disorder (BPD) and ways of supporting them. 2. To identify training needs. Method: A cross sectional survey of adult mental health clinicians employed by Northamptonshire Healthcare NHS Foundation Trust (NHFT). Results: 1. Response rate: 69% (185 of 269)inlcuding : Psychiatrists 40 (85%), community staff 98 and inpatient staff 47. 2. Self-rated ability to diagnose/identify BPD: very good: 19 (10%), Good, 65 (35%), average, 74 (40%) and 19 (10% were unsure and 9 (5%) did not answer. Preferred diagnostic system : ICD-10: 27 (15%), DSM-IV: 9 (5%), clinical sense: 139 (75%) and 9 (5%) did not answer. 3. Working with BPD is experienced as: Enjoyable: 9(5%), Challenging: 111 (60%), stressful: 27 (15%), very stressful: 19 (10%), I hardly like: 9 (5%), no answer: 9 (5%). 159 (85%) agreed that training is needed, 19 (10%) did not agree, 6 (3%) were unsure and 4 (2%) did not answer. Conclusion: The majority of clinicians' experience managing individuals daiagnosed with BPD as challenging and agreed that training is needed.