RADAR is a framework for evaluating information created by Jane Mandalios of the American College of Greece (2013). RADAR strives to be a framework, not a be-all, end-all requirement. If any information source raises concern in your RADAR, there is probably a good reason and there may be a problem with the information at hand. RADAR can help you remember what questions to ask about information to determine if it is good for your research. If you are still unsure at the end of your search, do not be afraid to ask for a help at a Research Help Desk or through Ask-A-Librarian.
Mandalios, J. (2013). RADAR: An approach for helping students evaluate Internet sources. Journal of Information Science, 39(4), 470-478.