Para data are administrative data about the survey that are collected besides the actual survey data. In TwinLife, mainly month and year, in which an interview was conducted, is delivered as para data. Time stamps of questions or thematic blocks are recorded as well, but not delivered in the Scientific Use File. Under certain circumstances, it is possible for researchers to get access to the time stamps (e.g., for methodological research). Please contact ✉ This email address is being protected from spambots. You need JavaScript enabled to view it. if you are interested in using these data.