What does this mean? In 1968 Robert Rosenthal and Lenore Jacobson gave all the children in an elementary class a test. They then told the teacher that certain of these children were extremely intelligent (the children were actually quite average). At the end of the school year Rosenthal and Jacobson came back. The children they had identified as potentially high performers had made significantly more progress than the rest of the class, based on test scores.
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