In а peri-urbаn district in Gаuteng Prоvince, the Sоuth African Natiоnal Department of Health has identified a rapid rise in substance abuse among young adults aged between 18 to 30 years. This rapid rise is driven by socioeconomic challenges, limited access to prevention and treatment services, and high levels of stigma. The increase has contributed to a rise in gender-based violence, mental health disorders, and road traffic injuries. Previous interventions have been short-term, poorly coordinated, and have failed to achieve sustained impact. You are appointed as a Project Manager to lead a comprehensive intervention programme aimed at reducing substance abuse and its associated harms in this district.Explain how you would ensure the success and sustainability of this intervention programme. Your response should consider key project management principles and social and behaviour change communication (SBCC) strategies.