Let the local communities do the job." Classroom shortages. splitshift arrangements in existing classrooms. all these phenomena are too well documented and too clearly portrayed to require further proof. The need exists. and it is a severe one. But there is one reason for Federal concern. one source of the growing need for Federal activity in this field which has not received a great amount of attention. I refer to the increasing mobility of the American people. including Americans of school age. and to the fact that these migrant Americans impose a burden upon our public schools with which State and local tax structures could keep up only with the greatest conceivable difficultyif at all. A recent article in the Phi Delta Kappan by Mr. W.