The education of students with intellectual disability, like all students, is influenced by assessments. For students with intellectual disability, assessment is used to evaluate individuals as having an intellectual disability (e.g., intellectual functioning assessments and adaptive behavior assessments), as well as to guide instruction and making decisions about what to teach. Throughout this chapter, the authors present assessments related to the determination of individuals having intellectual disability as well as ones that inform, guide, or evaluate instruction for students. In addition to presenting traditional assessment options for students with intellectual disability, the chapter also presents some innovative options for determining what to teach students with intellectual disability. [For the complete volume, "Traditional and Innovative Assessment Techniques for Students with Disabilities. Advances in Special Education. Volume 36," see ED614233.]