This assessment is designed to develop your research, critical review of evidence and writingskills to support health advocacy in the domain of Public Health; The assignment will reflecton policy content relevant to the population health issue and critical analysis of evidencebased research to inform your practice.In this assignment you will select a vulnerable population group (people living with mentalillness and Substance use Disorder (SUD) comorbidity, Australian Indigenous peoples, adultswith depression or Post Traumatic Stress Disorder & youth (15-24), specifically on theprevalence of comorbidity or co-occurring mental health and AOD disorders or misuse asdiscussed in this topic.The report will investigate social, environmental, interpersonal and economic factors whichare known to influence the development of mental and co-occurring SUD and problems. Thereport will link to current Australian policy approaches to prevention, treatment or supportfor the chosen population group which address the risks or protective factors identified.