; or (B) one large multisite well-conducted experimental study carried out in such a setting. (3) Low-evidence The term low-evidence , used with respect to an intervention, means an intervention that is shown to produce or have the potential to produce a positive effect on important outcomes, in a study based on a reasonable hypothesis and with credible research findings, such as a correlational study with statistical controls for selection bias or descriptive research such as a case study. (4) Moderate-evidence The term moderate-evidence , used with respect to an intervention, means an intervention that is shown to produce a positive effect, that is sizable but not yet conclusive, on important outcomes, in at least one well-conducted experimental study, or in a rigorous quasi-experimental study from which a researcher can draw a causal conclusion regarding the intervention’s effectiveness. (5) Well-conducted experimental study The term well-conducted experimental study means an experimental study such as a study with randomized controlled trials. .