All research requires preliminary research, where the researcher identifies the basic information about the topic, explores possible sources of information, and begins to troubleshoot any possible problems during the research process--not enough sources, the need to revise a working thesis statement, etc.
When working with a group, it is especially important to outline each member's research responsibility so to avoid confusion, extra work, wasted time, and missed deadlines.
This Google Doc template can help you organize your preliminary research with your group. (Open & copy into your Google Drive, then share with your group members).