It is a complicated question to answer since depending on the training you have, it is confused with methods, techniques, strategies or procedures. It could be said that the methodology studies the methods that are used within a research work; However, where is the design?
Research methodology is the explanation of the researcher's intention regarding the mode of data collection in a research work process. It is a detailed, well-arranged plan for resolving research issues. It ensures reliable, valid outcomes are achieved, to address research aims and objectives. It further explains what data is intended for collection, where it will be collected, and how it should be collected and put together for analysis.
Research methodology is the systematic framework, strategies, and techniques used to conduct research. It outlines the methods, processes, and rationale behind data collection, analysis, and interpretation to ensure the research is valid, reliable, and credible.