Literature reviews should be selective and critical. Reviewers do not want to read through a voluminous working bibliography; they want to know the pertinent works and your evaluation of them. Discussions of work done by others should therefore lead the reader to a clear impression of how you will be building upon what has already been done and how your work differs from theirs. It is important to establish what is original in your approach (innovative), what circumstances have changed since related work was done, or what is unique about the time and place of the proposed research. Note: guidelines may require a separate section for innovation or for transformative potential of the work.
Triangulation is one test for improving the validity and reliability of research or evaluation of findings. As the name implies, triangulation is a strategy that controls bias and helps to establish valid conclusions because it uses at least three (thus, the "tri-" prefix) different types of methods or tools to collect data from which conclusions are made. Many researchers argue that triangulation strengthens a study by combining methods. This can mean using several kinds of methods or data, including using both quantitative and qualitative approaches. By using at least three different methods, the researcher is about to obtain multiple, diverse perceptions of a single concept.
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