Adults with intellectual disabilities can often have their views and needs overlooked and are frequently not sufficiently involved in their own care or behaviour support plans. The central focus on values in ACT helps people identify what matters to them, allowing the practitioner to instead truly support the values-basedgoals of the individual with intellectual disability. This first-of-its kind guide adapts an ACT model to ensure a meaningful, person-centred therapeutic approach for this group.? From managing the lifelong impact of cognitive difficulties, having trouble regulating and understanding feelings, and experiencing distress from disability related trauma - this guide will help the practitioner adapt ACT for salient issues related to adult intellectual disability. With case studies, advice on session structure, and ideas for exercises, it contains a wealth of resources for practitioners, supporters and wider networks.