The researcher should know and determine the most appropriate when starting to write scientific research as determination of the problem and its solving and the previous studies.
To be a good researcher, you must have a question that other researchers have not answered (or have not answered sufficiently).
You must make sure you understand the theoretical framework in which the question and any answers reside.
Then you must design a way of collecting data DNA analyzing it that answers your question effectively, drawing on the theoretical framework for both design and analysis.
Finally, you must be insightful about what your findings mean in the broader context of your field and how others can use your findings.