Time and resources needed - 1st time researchers often underestimate how long it takes to collect data, analyse it and then write a report. A lone researcher would only be able to do a small-scale study (case study). Large-scale studies would need a team of professional researchers and can take years to complete.
Access to the subject matter - It is harder to get permission to study what happens in a doctor's surgery than to study what happens in a classroom. Rich & powerful people can deny access to a researcher easier than a poor person could.
Whether funding is available - Large scale researches are expensive : salaries, equipment, living expenses, travel, computer resources, secretarial help etc. Individuals & organisations can bid for funds from sources such as councils or charitable trusts - there is stiff competition for this money. Many researchers have limited resources.
Researchers choice of topic and research methods is affected by practical, ethical and theoretical issues.
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