In a best-case scenario, you will be able to find a high-quality pre-appraised information source to answer your question. However, this is not available for all topics. Furthermore, you may also find it useful to appraise pre-appraised information. Once you figure out what to look for and where to look, you still have to worry about the quality of the material you find. You should always question the quality of the material you find. Remember, a poorly done systematic review is not better than a well done randomized controlled trial. On this page, you will find some resources to help you appraise the material you find.