Theoretical knowledge is important because it can affect behavior—in this case the interpretive behavior of the clinician using an intelligence test. Our interpretations of test results, either in writing or presented orally in a parent conference or other venue, are expressions of our theoretical knowledge or biases. Similarly, a person’s reaction to being called into the boss’s office is influenced by theory depending on whether one thinks that the boss is calling the meeting to offer congratulations or a reprimand. So too, in intellectual assessment, a psychologist may offer either a dismal prognosis for or a favorable one depending on the examiner’s theories of intelligence. This is one crucial reason psychologists should have a clear understanding of intelligence theory.
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