Refining your topic is one of the most important decisions when you begin your work. If information on the topic can be found easily from many resources, you may want to consider narrowing down the topic to something more specified. Studying and reading basic literature on the topic field is key: you should know more about your topic than what you intend to include in your final work.
Mind maps and concept maps offer ways of specifying and outlining the research problem. A mind map is a tree-like figure where the topic is divided into sections and further into their subsections. Concepts and their connections are easier to identify by using a concept map (you can use e.g. the CmapTools program to create a concept map).