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Critically Assess Different Theoretical Approaches to Speech Production Essay Preview: Critically Assess Different Theoretical Approaches to Speech Production Report this essay There are two main theories of Speech production, Spreading Activation Theory – SAT (Dell, 1986: Dell & OSeaghdha, 1991) and Word- Form Encoding by Activation and Verification – WEAVER++ (Levelt et al., 1989: 1999)..