The purpose of treatment manuals is to

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Treatment manuals serve two main purposes: firstly, to clearly define the independent variable (i.e. the treatment being tested or administered) and secondly, to limit the amount that therapists vary in how they deliver the treatment. By doing so, treatment manuals increase internal validity by ensuring that all participants receive the same treatment, and reduce confounding variables that could affect the results. As a result, treatment manuals can increase the reliability and replicability of research findings, ultimately improving clinical practice.

The Purpose of Treatment Manuals Is to