Intervention Fidelity in Research answers the question “Was the intervention delivered as intended?” It’s a measure of how close to what was planned an intervention or experiment ended up being in practice.
An intervention is some form of treatment, but it could also be a specified active or non-active non-treatment. For example, a placebo is an inert intervention; Treatment as Usual (TUA) can be a very active intervention.
Intervention fidelity is especially important in determining the place an experiment or study might have in a larger study, and whether the results can be replicated or generalized.
Determining Intervention Fidelity in Research
To assess fidelity, the intervention’s reliability and validity must be assessed using appropriate methods.
There is no one statistic or measurement technique that is used to determine intervention fidelity everywhere. Researchers involved in a multi-faceted project, though, often work to put together a project-specific rubric by which the fidelity of all related experiments or intervention can be judged.
Sometimes a survey, given to either researcher or the intervention subject, is used to determine intervention fidelity. Sometimes assessments are conducted within and after an intervention to check just how closely a researcher is following the specified procedure; or a team of experts is asked to do spot checks on interventions in progress.
The key is that the intervention be well defined beforehand, and areas in which it is important to stick to the book as well as those in which some latitude for change may be given are specified in advance.
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