In the schools, the primary clients are the students. Other clients include parents, citizens, the community, and educators--all stakeholders in the processes and the products of schools. Professionals in administrative, instructional, and student services are committed to serving these internal and external clients by providing for offerings and outcomes to advance and enhance learning and the learning experience. To ensure effective planning, implementation, and evaluation of these provisions for clients, certain principles and guidelines for beliefs and behaviors are adopted. These principles and guidelines are identified as ethical standards and codes of conduct. This chapter examines professional ethics, specifically as they relate to educational assessment. (Contains 41 references.) (GCP)