In an undergraduate dissertation, you therefore need to show a capacity to engage with a broad field of research, to synthesise diverse and even opposing approaches to a problem, and to distil this down into a design for a research project that will address your research questions with the appropriate level of scholarly level.
When developing and presenting your dissertation methodology, you should therefore think not just about how well it can answer your particular question, but also about how transferable it is — whether it can be used by other scholars to answer related questions, or whether it can be made more adaptable with just a few tweaks without compromising your own use of it, of course.
The Household Survey and Census ask closed questions, and often market researchers who stop you in the street do too. Remember to include what type of data you were working with qualitative or quantitative?
What should my methodology not contain? This should be clear and detailed enough that another scholar is able to read it and apply it in some way, outside of the immediate context of your dissertation.
Rather, flag up these problems and show your examiners how you overcame them. Valid research requires a carefully designed study with controlled variables that can be replicated by other researchers.
You will probably generate more references than you can read. What is the scope of your data and conclusions?
Is this a standard methodology in your field or does it require justification?