It is important to make explicit the point that the third standard set by Castañeda is intended to trigger adjustments in either the educational theory or in its implementation. This is itself a de facto fourth standard, that the educational system, be it a local or state agency, be prepared to use appropriate information on program effectiveness to improve its programs. Local and state system capacity for addressing the needs of ELL students based on sound information should be a further requirement in addition to the three standards.

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