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Desegregation can be delayed for many reasons, including the condition of school buildings, problems with school busing, and local laws that need to be revised. State and local school districts will be responsible for implementing desegregation in their ee Hee lem Desegregation should start as soon as possible, but courts can extend the process if local school districts request it. Direction Interpretation "School authorities have the primary responsibility for [explaining], assessing, and solving the varied local school problems which may require a solution in fully implementing the [Brown decision]." "(T]he courts will require that the defendants make a prompt and reasonable start toward full compliance with our [Brown] ruling. ... The courts may find that additional time is necessary. ... The burden rests upon the defendants to establish that such time is necessary in the public interest and is consistent with good faith compliance at the earliest practicable date." "The courts may consider problems [with desegregation]... arising from the physical condition of the school [buildings], the school transportation system, personnel, revision of school districts and attendance areas into compact units to achieve a system of determining admission to the public schools ona nonracial basis, and revision of local laws and regulations