The methodology chapter of a dissertation or thesis outlines the methods used for research. It includes:
1) An overview of the research questions and problems addressed.
2) A description of the methods used to collect and analyze data, including the research design, sample, instruments, and procedures.
3) Justification for the selected methods and an explanation of their soundness and ability to account for variables.
The methodology chapter provides enough detail for readers to understand the research process without allowing them to recreate it exactly.