This training session will introduce participants to the Dynamic-Maturational Model (DMM) of Attachment and Adaptation and its relevance to assessment, formulation and treatment planning for adults who have committed sexual offences. The DMM is a strengths-focused, non-labelling and non-stigmatising model of attachment, focused on the function and meaning of behaviour and how people adapt differing strategies to meet fundamental attachment needs. The model was created by Patricia Crittenden and developed out of her studies with Mary Ainsworth and John Bowlby. The DMM is particularly relevant to approaches such as the Good Lives Model, desistance theory, systems-focused thinking, the biopsychosocial approach and related approaches. Attachment theory is increasingly used as an underlying theory to support treatment approaches, and the DMM is a model of attachment that is well suited to forensic practice.