A good research design using appropriate research method(s) ensures data obtained answers the research question effectively.
“A goal without a plan is just a wish” --Antoine de Saint Exupery
Balance the time, strengths, and weakness of each method when selecting.
Select a research method based on your research goal and subjects to collect your data.
The method will produce different kinds of data (e.g., surveys produce short answers, experiments produce data in a controlled environment).