This report presents a comparative analysis of three Australian organizations: Youth Support Advocacy (YSAS), Western Health Foundation, and Taskforce. YSAS, focused on youth aged 12-21, employs the disease model, providing rehabilitation, withdrawal, and outreach programs, primarily funded by the Victorian government. Western Health, offering healthcare services to a large population in Melbourne, utilizes the public health model, focusing on wellness and harm reduction, supported by fundraising. Taskforce, serving individuals and families, applies the social learning model, addressing social issues like drug and alcohol dependency, funded by federal grants and donations. The report examines their core values, service differences (YSAS targeting youth, Western Health serving a broader community, and Taskforce addressing the general public), and resources, highlighting strengths such as YSAS's stable funding, Western Health's large staff, and Taskforce's federal funding. The analysis also notes commonalities in their nonprofit status and focus on behavior change, emphasizing their roles in addressing substance abuse and promoting health in Australia.