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This thesis explores the use of adapted Dialectical Behaviour Therapy (DBT) with individuals with Intellectual and Developmental Disabilities (ID/D). DBT is a multi-modal psychological intervention that aims to increase skills in interpersonal effectiveness, distress tolerance, emotional regulation and mindfulness. It was initially developed for individuals who presented with parasuicidal behaviours, and is recommended for the treatment of Borderline Personality Disorder (BPD). This thesis is presented in five papers; a systematic literature review, three empirical papers (a, b &c), and a critical review and reflection of the research process. The systematic literature review provides a narrative review of published research regarding the adaptations and outcomes of DBT for individuals with ID/D. Seven studies were reviewed using the Evaluative Method for Determining Evidence Based Practice (EBP) (Reichow, 2011). The findings detail the adaptations, results and critical appraisal of the research to date. The empirical papers consider the outcomes of adults with ID/D who received adapted DBT in a community psychological therapies service. The papers present different methodologies, and combined produce a consilience of evidence regarding the suitability of DBT for this population. Paper 2a found significant reductions on measures of depression, anxiety and anger, and increased mindfulness skills amongst 18 participants following DBT. Paper 2b uses repertory grid technique to explore the psychological changes that occur following DBT for seven participants, and found overall changes in personal construing and improvements in self-esteem. Paper 2c considers the psychological changes that occur in further depth through the presentation of two case studies. The case studies consider the complexity and idiosyncrasy of the individuals and gives consideration to the use of repertory grids to identify implicative dilemmas as part of clinical assessments. The final paper provides a critical review with personal reflections of the thesis. The author considers the research and clinical implications of the study.