An intervention study refers to a research approach that seeks to alter a particular condition or behavior to determine the cause and effect relationship between the intervention and the outcome. Synonyms for intervention study include experimental study, controlled trial, clinical trial, treatment study, intervention trial, and experimental intervention study. These studies are often used in healthcare, psychology, and social sciences to determine the effectiveness of various treatments, medications, and interventions. Intervention studies may be randomized or non-randomized and usually involve a group that receives the intervention and another group that does not receive the intervention, which acts as a control group.