A focused topic is only the beginning of a good research project. As you explore and refine your topic, keep track of questions that occur to you. This list of questions will come in handy when you are refining your topic idea into a research question, or series of questions. The research questions you develop will further focus your project and serve as a guide for developing your methodology and for identifying participant groups or other research materials (e.g. samples, museum collections, archives, and datasets).
If you are struggling to select a topic, here are a few tips:
Finally, watch this brief video from NC State on choosing a research topic, Picking Your Topic IS Research!. It shows how topic development and research are intertwined.
A well-formed research question should include three parts: 1) the problem that you are investigating, 2) your thesis or argument, and 3) the limits of your project. Research questions should be focused enough to guide your project. They will serve as the primary tool for defining the scope of your research, analyzing your data, and communicating results.
The Craft of Research by Wayne Booth is an excellent resource for any researcher. This book covers the entire research process from topic development to writing. It is full of sound advice presented in a straightforward and engaging style. See section 3.3 in the 2016 edition for advice on developing questions.