Time and Money
- Certain studies may require postage costs, researching costs, etc.
- Certain studies may take a long time due to limited researches, response times, etc.
Requirements of Funding Bodies
- Research institutions, businesses, and other organisations may require certain methods to be used, or a certain format to be used.
Personal Skills and Characteristics
- Some researchers can build a rapport with the individual, etc.
Subject Matter
- Some groups are easier to study than others, written questionnaires are useless studying people who cannot read, etc.
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