In a randomized controlled trial, the impact of a program is determined by randomly assigning individuals to an intervention group or control group.
a type of trial. The technique divides individuals at random into a group which receives an intervention, e.g. a treatment, and a group which does not. The impact of the intervention is assessed by comparing the outcome in these two groups.
For the purposes of this guideline, a study in which subjects are assigned to conditions on the basis of chance, and where at least one of the conditions is a control or a comparison condition.