A traditional interaction between a speech-language pathologist and a client is most frequently characterized by a request for some sort of speech and language performance, followed by the client's response, and evaluated-usually for accuracy relative to some objective-by the clinician. This interactional sequence is so pervasive that it is usually described as a request-response-evaluation exchange. It been described and observed in all different types of speech-language therapy sessions, across diagnoses and treatments.
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