Review articles give you an overview of your topic on the current state of the research. Review Articles explain:
This information is based Review Articles - Finding Journal Articles 101.
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What is Research Design? How is it different from Research Method?
Research design is how you will answer your question. It's a plan to answer your research question. A research method is your strategy used to implement that plan. These ideas are closely related but research design ensures you will answer your research question more effectively.
Which research method should I choose?
It depends on your research and the data you are trying to collect. Common research methods used are: