In single-subject designs, the researcher must:

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In single-subject designs, the focus is on the individual participant and their response to the intervention or treatment being studied. As a result, randomly assigning subjects to groups is not applicable in this type of design. Instead, the researcher must determine the meaning of the pattern observed (e.g., whether the treatment had a significant effect on the participant's behavior). The choice of probability level will depend on the specific study and research question, but there is no standardized level that must be followed in single-subject designs.

In Single-Subject Designs, the Researcher Must