Research and Reference Model - Different looks at the Methodology of Research A Framework for Research Methodology; with an article that explains it. Also has a table that describes the strengths and deficiencies of different research methods.
Decision tree to select which stats test
Qualitative Research Methods
Literature Review - From Doing Your Undergraduate Project: The Literature Review Sage Research Methods
Table identifying the key differences of quantitative and qualitative research methods. Key headings include: examples, perspective, purpose and design.
Starting from the conception of the research idea to the time when you reach the conclusion, all the steps involve decision making. Research Methodology Writing involves selecting the best methods and balancing them.