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Relationship Development Intervention… its effectiveness and identify which individuals are most likely to benefit from it. I think that this lack of scientific support is the reason why you don’t hear more about RDI. Health and science journalists, for example, typically report on … inflate its benefits. So how do we control for bias in studies? For starters, it’s important to have a control group. The participants in this group receive a comparison treatment. They should be similar in age, behavior and other aspects to the “active treatment” …