Teachers who do not continually progress, regress. There are four main streams of in-service teacher education: advanced study towards academic progress, advancement as teachers, professional regeneration, and advancement towards new or special objectives. In-service training must bring about the continuous revitalization of a teacher. Changes are recommended in the concept and practice of in-service teacher education along each of the four streams mentioned, particularly as they pertain to Israel. These changes include giving the responsibility for teaching a subject throughout a whole system to department heads of postprimary schools, encouraging further academic advancement, and founding a Council for the Pedagogic Guidance of Education Workers. (JA)