This report focuses primarily on the organisation, structure and content of the addiction services funded by North Dublin HSE and to a lesser extent other funders. The report identifies some of the necessary resources, training and support to ensure the effective delivery of addiction services. The report draws extensively on the work of the National Institute for Clinical Excellence (NICE), the National Treatment Agency (NTA) in the United Kingdom and other reports already undertaken for the Dublin North City and County addiction service and national reports. The recommendations in this report draw on the guidelines and service models developed by these agencies. The recommendations are developed as principles to guide the development of the Dublin North City and County Addiction Service.