Which two of the following are commonly understood to be advantages of case studies? Select one.

A case study is an intensive, in-depth analysis of an individual, group, or event. Its strengths and weaknesses are distinct from experimental methods. A major advantage is that it allows researchers to study rare phenomena that would be unethical or impossible to investigate otherwise (e.g., the effects of severe brain damage). Another key strength is the depth of information gathered; researchers can use a variety of methods (interviews, observations, tests) to build a rich, detailed picture. However, they suffer from major weaknesses, including a lack of generalisability, potential for researcher subjectivity, and difficulty in replication.