This report, prepared for HCS103, examines two key areas within social work practice: mental health and ageing. The mental health section focuses on depression and Substance Use Disorder (SUD), referencing the DSM-5 criteria and highlighting their impact on individuals and society, particularly within indigenous and non-indigenous populations in Australia and New Zealand. The report emphasizes the importance of comprehensive human services involving various organizations, agencies, and practitioners, considering cultural nuances and relevant policies. The ageing section explores the Transpersonal and Active Ageing theories, discussing their implications for service provision and the importance of tailored approaches to meet the needs of older adults, including those from indigenous communities. The report emphasizes the need for natural and healthy transitions into older age, considering individual preferences for service environments and the distinction between natural and disease-related ageing processes. The report references key sources such as Briggs & Adamson (2017) and Maidment & Hampson (2017) to support its analysis.