A continuing education unit (CEU) or continuing education credit (CEC) is a measure used in continuing education programs to assist the professional to maintain his or her license in their profession. Continuing education or professional development is required in many fields, including teachers, insurance professionals, interior designers/interior architects, lighting designers, architects, engineers, emergency management professionals, school administrators, educators, nurses, mental health professionals, psychologists and social workers. The continuing education unit is described as ten hours of participation in an education program.