Critical Reviews of Literature. By researching the current literature, you will have a better understanding of your context of the question or problem you are considering. A literature review is a critical, in- depth evaluation and summary of previous and current research. It establishes why you are pursuing a particular research study and validates your wanting to do so. You are evaluating the quality and findings of studies in a way that supports your own research. As such, you want to be critical of the credibility of the sources.