Having a background in instructional design, I would recommend taking a look at the title Measuring the User Experience: Collecting, Analyzing and Presenting Usability Metrics by Thomas Tullis and William Albert (Morgan Kaufmann Publishers, 2008). Chapter 6 in particular covers self-reported metrics, giving brief outlines and tips on how to collect and analyze self-reported data.
For example, the authors mention that the number of values on a rating scale can be an issue. An odd number of values has a center, or a neutral point, whereas an even number of values forces the user to slightly favor one end of the scale or the other. Personally, I happen to agree with the authors' opinion that a neutral reaction to something is perfectly valid and the rating scale should allow users to report that. Therefore, I would probably tend to use rating scales with an odd number of values, perhaps five or seven, unless there was a compelling reason not to.
There is also a companion website: http://www.measuringux.com/.
Finally, there is a Usability Professionals' Association that might give you more information: http://www.upassoc.org/
Best of luck with your thesis.