The following definitions have been drawn from numerous sources and are tailored specifically for content on the NREPP Web site. The terms defined here may have slightly different meanings in other settings.
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- Quality assurance
- Activities and processes used to check fidelity and the quality of implementation.
- Quality of Research
- One of the two main categories of NREPP ratings. Quality of Research (QOR) is how NREPP quantifies the strength of evidence supporting the results or outcomes of the intervention. Each outcome is rated separately. This is because interventions may target multiple outcomes, and the evidence supporting the different outcomes may vary. These QOR ratings are followed by brief "Strengths and Weaknesses" statements where reviewers comment on the studies and materials they reviewed and explain what factors may have contributed to high or low ratings. For more information on the scientific reviewers who rate QOR and how ratings are derived, see the NREPP page on Review Process Quality of Research.
- A study design in which (1) the intervention is compared with one or more control or comparison conditions, (2) subjects are not randomly assigned to study conditions, and (3) data are collected at pretest and posttest or at posttest only; includes time series studies, which have three pretest and three posttest data collection points. The quasi-experimental study design provides strong but more limited scientific rigor relative to an experimental design.