Assessment, one of the stages of social work practice, plays a key role in the delivery of effective services, and is used when selecting interventions, as well as monitoring the effectiveness of those interventions. This chapter examines assessment as both a product and an ongoing process, as is relevant to social work intervention in schools. Various types of assessments often utilized in school settings are explored, including social developmental study, functional behavioral assessment, classroom assessment, and school climate survey. This chapter includes an application of multidimensional assessment in the school setting. Additionally, the chapter describes assessment tools, including structured observations of students. It includes a discussion of the essential consideration of culture when assessing client systems of all sizes, including students, families, classrooms, schools, and communities.