I am working on a research paper and I want to distribute a survey which includes 9 blocks (choice set) ensuring that every respondent can answer only one block! question!
It sounds as if you're looking for a survey platform that incorporates assignment and/or skip logic. A lot of them do. Here's a link to a review of a number of survey platforms that might be helpful: https://www.pcmag.com/roundup/339397/the-best-online-survey-tools
Hi! You might want to check this free online randomization app. You can apply simple randomization, block randomization with random block sizes and also stratified randomization.