School psychologists have an ethical obligation to be advocates for students. However, the ethical principles of the National Association of School Psychologists (NASP) do not define what it means for school psychologists to be advocates for students, except through the inferences that may be drawn from what school psychologists must be, and do, in order to comply with the NASP ethical principles. This dissertation proposed a definition of advocacy, which was then presented to a focus group of school psychology experts, to an expert panel, and then researched through a census survey of the...