The only adult in the dassroom seems to be loitering. She is not standing in the front lecturing, or sitting at the teacher's desk reading to the dass, or grading papers. She is moving about the dass- room from student to student, answering a question with a whisper here, offering a quiet suggestion there, helping with a chart decision here, and giving a pat and a smile of appreciation there. Now and then, she calls for a dass one-minute practice ses- sion.
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Ogden R. Lindsley (1992) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: