This chapter discusses the techniques for mobilizing community participation, the impact of social institutions on society, and the impact of the political environment on policy-making. It describes the concepts of social policy development and analysis, techniques to inform and influence organizational and social policy, and theories and methods of advocacy for policies, services, and resources to meet clients'/client systems' needs. Advocacy is one of a social worker's most important tasks. The goal of social work advocacy is to assist clients to strengthen their own skills in this area. Fundamental to social work is advocating to change the factors that create and contribute to problems. Social workers may assist by locating sources of power that can be shared with clients to make changes. There are three major types of prevention strategies—primary, secondary, and tertiary. Optimally, all three types are needed to create comprehensive strategies of prevention and protection.