With the rapid expansion of education in many developing countries and the demands of new curricula and methods of teaching, the problem of providing a teaching profession suitable in quantity and quality for the task has become increasingly difficult by traditional patterns of teacher education. There is therefore an urgent need to consider ways and means of increasing the supply of teachers and renewing their training in such a way as to enable them to meet the challenge of changing needs. In-service teacher training in various forms would appear to offer a potential solution.