This document provides guidance on writing the methodology chapter of a thesis. It recommends that Chapter 3 may be titled with something specific to the work, such as "Network Design" or "Routing Protocol". The methodology chapter should describe the fundamental knowledge underlying the work, showcase the novelty of the proposed design or approach, and explain the new methods, designs, or algorithms. It then provides guidance on the modelling or experiment setup section, including explaining the simulation software or tools, deriving any mathematical models, and describing the experimental setup with details like equipment used. Parameters for the simulation or experiments should also be described.