What is a Single System Research Design (SSRD)?

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Thank you for your sharing.

Single-system research design (SSRD) is a research format that permits uncontrolled program evaluation and controlled experiments with only one subject, one group, or one system. SSRD involves studying a single individual or system by taking repeated measurements of one or more dependent variables over time. Controlled SSRDs demonstrate experimental control by manipulating an independent variable and showing corresponding changes in a dependent variable, then replicating manipulation of the independent variable and subsequent change in the dependent variable to demonstrate a cause-and-effect relationship. Replications have been performed through operations such as changing a dependent variable and then reversing that change; producing successive change across different behaviors, settings, or subjects; producing change according to a pre-determined random schedule, or incrementally changing the level of a dependent variable.