Case studies

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  Allows researchers to study things that may be unethical or impractical to study.
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  A great deal of quantitative and qualitative data can be gathered giving a detailed insight into the person or group
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  Longitudinal so changes over time can be observed.
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  Lacks population validity- due to small sample.
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  A detailed investigation of one person cannot be replicated- lack of scientific rigour as they cannot be tested for reliability.
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  The researcher may become too deeply involved with the person or group being studied. This means it will lack objectivity.