Thank you very much for your reply! Actually, I am looking for a way to find the Amazon Turk workers' IDs in the dataset (not the random generated codes). I am planning to launch an official survey in few days, so I want to make sure I can link the responses in my data, to workers (or persons) who used Amazon Turk. For now, I have launched a test survey, I downloaded the data, but I cannot find the workers' ID. Please check the screenshot below (from Amazon Turk) so you can better understand my issue. Do you have any solution for that? Thank you in advance