Narrow down your mater's thesis topic so that it clearly indicates:
For instance, if your initial topic was quite general such as "Digital innovation in schools", the narrowed-down version of the same topic is something like this: "Comparing concerns-based adoption of digital transformation in five schools from the Future Classroom Lab programme: a multiple case study". In this new, narrowed-down topic you clearly see all the components requested by me:
Now, find a suitable scientific data collection instrument for your research. I recommend to use scholar.google.com and seek at the end of relevant research papers an annex that shows the full instrument (e.g. survey questionnaire). For instance, here are some instruments: