Paragraphs in a research paper or project should have information from sources, as well as your interpretation/ analysis or explanation of that information. Although it is always good to express your opinion, your paper needs evidence to help prove your argument. It's always good to have a lot of outside sources, too, but your paper or project should have some creative ideas and opinions from you too. If you have both your opinion, and outside sources, then you probably have a good research paper or project.