The purpose of this paper is to focus on the development of Keep Safe, a manualised group intervention for adolescents with intellectual disabilities (ID) who display harmful sexual behaviour (HSB) as the initial phase of a feasibility study. National reports have highlighted the need for the development of specialist programmes, as adolescents with ID make up a significant proportion of young people referred to specialist HSB services and there is a lack of evidence or practice-based interventions for them. Aims included taking account of adolescents’ and families’ needs, motivations and practical commitments, integrating best- practice and being accessible and appropriate across different types of services.

Keep Safe development progressed from the practitioner/researcher collaborative young sex offender treatment services collaborative-ID through a project team, Keep Safe development group, comprising a range of practitioners with a variety of clinical expertise across services and an Advisory Group of people with ID. An expert-consensus methodology based on the Delphi method was used. The iterative process for the manual draws on the slim practice-based evidence from UK, New Zealand, North America and Australia.

Keep Safe comprises six modules distributed through 36 term-time young people’s sessions, alongside 16 concurrent parental/ carer sessions (some joint). The main focus of Keep Safe is to enhance well-being and reduce harm. Four initial sites volunteered as feasibility leads, and two more were added as recruitment was more difficult than foreseen.

National reports have highlighted the need for the development of specialist programmes, as adolescents with ID make up a significant proportion of young people referred to specialist HSB services and there is a lack of evidence or practice-based interventions for them. This study is innovative and valuable given the recognition that research and practice is significantly lacking in this area.