This resource is intended for harm reduction service providers with limited experience of working with children and young people who inject drugs. It sets out a process organized in 10 steps: 1) Exploring attitudes and sharing concerns, 2) Assessing the policy and legal environment , 3) Understanding key principles for working with children and young people, 4) Exploring your current capacity to work with children and young people who inject drugs, 5) Assessing the needs of children and young people who inject drugs, 6) Determining your organisation’s capacity to provide key services, 7) Mapping other available services, 8) Considering the impacts on staff , 9) Policies to assist children and young people who inject drugs, 10) Developing your policy.