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sheltered classes are for intermediate [language learners], not beginners.” The reason should be obvious: “It is extremely difficult to teach subject matter to those who have acquired none or little of the language. Beginners should be in regular ESL, where they are assured of comprehensible input.”63 Unrealistic language demands create, in effect, a sink-or-swim situation, in which academic learning is minimal.
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James Crawford (The Trouble with SIOP®: How a Behaviorist Framework, Flawed Research, and Clever Marketing Have Come to Define - and Diminish - Sheltered Instruction)