Which research design is often used to provide existence proof that a given psychological phenomenon can occur?

Name: Which research design is often used to provide existence proof that a given psychological phenomenon can occur?
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Case study design is often used to provide existence proof that a given psychological phenomenon can occur. It allows for in-depth investigation of a single case or a small number of cases, which can demonstrate the existence of a phenomenon even if it is rare or complex.

Which Research Design Is Often Used to Provide Existence Proof