A teenager with severe obsessions (unwanted thoughts) and compulsions (uncontrolled, ritualistic behaviors) tried to committ suicide by shooting himsielf in the head. He survived the shooting and discovered that all his obsessions and compulsions were gone. A psychologist did in-depth interviews with this person and linked the area of brain damage from the shooting with obsessions and complusions.

Which research method is illustrated here?
(scientific method, experimental, quasi-experimental, correlational, survey, case study, single-subject design.)

What are the strengths of this research method/research project?

What are the weaknesses?

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