If you only want participants to be able to take part in one version of the study, you'll need to use our 'exclude participants from previous studies' prescreener. You can also take advantage of our tools Screener sets and Participant groups.
If you’re recruiting mutually exclusive demographic groups, you may not need to use the above prescreener. For example, if one study is only recruiting UK residents and the other only US residents, this means we will show each study to a unique group of participants, and you can publish them simultaneously without the participants overlapping.
If your design needs studies published at exactly the same time, we recommend running one study on Prolific and split participants into different conditions via your survey.