Randomized Controlled Trial is a controlled trial study in which participants are assigned to a study group. In a randomized controlled trial, participants are assigned to treatment conditions at random. Procedures are controlled to ensure that all participants in all study groups are treated the same except for the factor that is unique to their group. The unique factor is the type of intervention they receive.

The primary goal of conducting an RCT is to test whether an intervention works by comparing it to a control condition, usually either no intervention or an alternative intervention.

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Cherry, K, Cooper, C, Cross-Hemmer, A, Duong, T, Furrer, C, Green, B, Rockhill, A, Rodgers, A, "Oregon's IV-E Waiver Demonstration Project: Final Evaluation Report." Relationship-Based Visitation & Parent Mentor Evaluations. Center for the Improvement of Child and Family Services Portland State University. December 2015
Cherry, K, Cooper, C, Cross-Hemmer, A, Duong, T, Furrer, C, Green, B, Rockhill, A, Rodgers, A, , "Executive Summary: Oregon's IV-E Waiver Demonstration Project." Relationship-Based Visitation & Parent Mentor Evaluations. Center for the Improvement of Child and Family Services Portland State University. December 2015
Illinois Birth Through Three Waiver, "Developmentally Informed Child and Family Interventions IB3." Semiannual Progress Report. Prepared for the Children's Bureau, Submitted by the Illinois Department of Children and Family Services. July 31, 2015