The methodology chapter in a dissertation is typically written after the literature review chapter and before the results chapter. The methodology chapter outlines the research methods and procedures used to answer the research questions or hypotheses, and it is usually one of the longest and most detailed chapters in the dissertation.
It is important to note that the methodology chapter should be written in the past tense, as it describes what was done during the research process. The chapter should be well-organised, clearly written, and provide enough detail so that others can replicate the study if necessary.