If you have several projects, it would be ideal to fill out the survey once for each project. However, if the answer to all the questions for every project is the same, you can fill out the survey once.
¿What do I mean with TDD?
En the lifecycle starts with unit-tests -> development -> green light -> refactor (this last step may be skipped in some cycles)
¿What do I mean with ATDD?
It's like TDD, but the lifecycle starts with acceptance-tests, and inside the cycle there are many TDD-cycles.
It may be a big simplification, and they are not mutually exclusive, but I'm interested to know if only unit-tests were used in the sense of UTDD (unit-TDD) or if acceptance tests guided the development.
The thesis will be written in Spanish, since that's my native language, but I'll do my best effort to write the conclusions (in a paper or something) in English, so everyone that helped me can read it.
Thank you very much!