With the exception of metropolitan school systems, it has been only during recent years that districts have felt the need for written board policies. '!'his need was generated by the stimulus of increased population growth and mobility especially since World War II, With growing numbers of children entering school, districts were forced to grow and change to meet the new demands made on them, No longer was it possible to conduct school affairs with the informality characterized by the "little rod schoolhouse". Increased size and the concomitant problems inherent in delegation of authority and implementation of pollcy throughout the school system encouraged school districts to organize their operations more efficiently. 'l'his necessitated the codification and systematization of the policies by which the district functions. As districts grew and the operation or school plants became more complex, school boards and administrators began to realize that school policies must be in writing to avoid administrator-board misunderstandings and community dissension.