Implementing change in organizational systems is challenging, and implementing a new psychotherapeutic approach is no different. A literature exists on issues in implementation across a wide range of domains (technological, healthcare, justice). However, little of it is utilized in endeavours to implement innovations in psychological treatments. This paper draws on the implementation literature and on the experiences of the British Isles DBT Training Team (BIDBT) in implementing Dialectical Behaviour Therapy (DBT) in mental healthcare systems in the UK over the last 13 years. This paper describes principles and strategies of ‘organizational pre-treatment’ as a necessary prerequisite to implementation.