If you conducted a survey, you need to specific about the exact age, gender, and number of subjects.
Also make sure to be specific about your equipment.
The Methodology section of a thesis or dissertation (also sometimes called the Methods or Materials and Methods section) is where you explain the exact procedures you used to conduct your research.
It should be very detailed - after completing this section the reader should be able to recreate the work that you did.
Often in the social sciences, instruments like surveys have to be tested for accuracy and usefulness before they can be used to address the main research question.
If your work includes this type of pilot study, you need to include that information in the Methodology.
As with the rest of the paper, the methodology should be in the third person and in past tense.
Start by outlining the basic style of your research. Is it correlational, causal comparative, or a mixed design? How have you accounted for bias or uncontrollable variables? Also address how the research design you chose is appropriate for the question you're trying to answer.
If you're doing work with animals or human subjects, you'll need to include in your methods a section discussing how you addressed ethical consideration.
This will likely need to contain a statement that your institution's review board has approved your research protocols.