The concept paper, the research proposal, and the research report are all parts of a formulated research project that culminates in a final research paper.
The concept paper is the initial writing step of the research project in which you gather your initial thoughts. The concept paper allows you to think about and record what the core questions and focal components of your research project are.
The research proposal is the next step of preparing to begin your research project. The research proposal is usually reviewed by a team of experts of the field of study, such as PhD professors at a university, who can approve the research proposal. At the point of approval, one can then begin the actual research project. The research proposal includes an extensive outline of what will be researched, the methods of research, the possible problems involved with the research, and a literature review of what is already known.
The research report is the culmination of all your research and conclusions in written form. The research report will include what you researched, how you conducted the research, what your findings were, what your conclusions are, and, often, implications or questions for further study.