THE ONLY REASON for the existence of a school building is that it is needed to house an educational program. The determination of need for school plant facilities is a local educational problem, whether the area referred to as "local" is the small rural district or the large city system. The problem of determining school plant needs on the local level may be simple or complex, requiring in the latter case careful and objective survey work that in some details may involve considerable research. The school plant survey or long-range school plant planning study is concerned primarily with the problem of determining what new buildings are or will be needed, what old ones should be remodeled and continued in use, which ones should be continued as they are, and which ones should be abandoned. These questions are related very closely to enrolment trends, both numerical and locational; to population trends; to conditions of the local school plant; and to educational organization and administrationl The need for research is involved in the accurate and reliable prediction of population and enrolment trends as they affect the determination of school plant needs. Detailed planning and financing, while a part of the complete school plant survey, are not specifically part of the problem of determining needs, but they are involved in the problem of meeting the needs as determined. Three school plant surveys are listed that illustrate technics of research used in determining school plant needs on the local level. In the Minneapolis School Survey, Holy (3) studied the location of all seventh-, eighth-, and ninth-grade pupils in relation to the junior high-school buildings and made recommendations toward the transfer of certain pupils from elementary buildings to junior high schools. Holy also determined objectively, thru an area study of the distribution of elementary children, that of eighty-five elementary schools in the city, twenty-one, including two portables, could be closed without denying any child a good school within reasonable walking distance. Engelhardt (1) in the Sewanhaka, New York, high-school district survey based his recommendations for ultimate high-school needs upon (a) analyses of elementaryand high-school enrolment trends, (b) trends in home building and an estimate of the number of homes in the area after the saturation point in building is reached, and (c) the establishment of a ratio of pupils to homes, which ratio predicts the total possible pupil population in the area after it is completely built up. Wilson (8) in the Reading, Massachusetts, school plant survey arrived at his recommendations for a long-range school plant planning program thru the analysis of enrolment and population trends, the establishment of a ratio