This chapter discusses various techniques for assessing student behavior, including observation, interviews, testing, and other methods. Observation involves watching students in different settings and recording target behaviors using methods like anecdotal notes, event recording, and duration recording. Interviews can be structured or unstructured. Psychological tests administered include projective drawing tests, apperception tests, and sentence completion tests. Adaptive behavior refers to a student's independence and social skills and is assessed using scales. Functional behavioral assessments identify why problem behaviors occur and how to address them through behavioral intervention plans.