The use of self-reports is another option for gathering information qualitatively. There are two forms of self-reports. The first is the interview method, in which the researcher poses questions to participants in either informal or formal settings and records the responses. The second form is the self-report instrument, in which participants respond to a questionnaire or some other type of structured instrument. Both forms have advantages and disadvantages. Structured instruments provide control over external and extraneous stimuli, permit comparisons of the responses, and aid in efficient data collection. Interviews may provide richer information and could tap aspects of the participants that go unmeasured in structured instruments, such as how the participants think and function in the natural setting. Unfortunately, the results of the open interview are difficult to use for comparison purposes among individuals or groups of individuals. The rich data gained through interviews could come at the cost of standardization, thereby ruling out comparisons across participant responses.
The third qualitative method of research is the clinical method, or case study. The case study allows the researcher to gain detailed information on one individual's development. The rich data provides an extensive picture of the developmental process of an individual. In turn this means that there is only one person in the study and that any conclusions that are drawn cannot be easily generalized to other individuals.
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