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How do I recruit a custom sample?

If you need to recruit a custom sample, and cannot obtain the specific population you require using our existing prescreening filters, it is not permitted to screen participants within your survey or study description. You can read more about why this is not allowed here.

Instead, you can run two separate studies on Prolific to recruit your sample.

Your first study would be a short study designed to filter your participants of interest. Your second study would be a longer one to actually collect the data. Please see below for a more detailed breakdown:

The first study

This should be a short screening survey, where participants answer your intended 'screening' questions and provide their Prolific ID. We recommend that your screening question is kept vague so as to not lead participants to answer in a certain way. For example, it would be better to ask 'Do you drink any of the following drinks?' than 'Do you drink [specific brand]?'

You can already prescreen the sample to some extent using our existing options - e.g. for any demographic requirements you may have.

You may need to survey quite a large number of participants in order to achieve your desired sample size for the main study. However, because this first study is very short, you can reward a small amount and therefore test more participants.

Importantly, you should approve every complete submission to this study, as it wouldn't be appropriate to reject people who do not meet your criteria.

After the first survey, you will have a list of participant IDs of those who meet your criteria. As always, we recommend that you automatically record participant IDs in your study.

The second study 

This study should direct participants to your main survey / experiment.

You can use a custom allowlist to only allow participants who met your criteria from the first study to take part in this one. In essence, you are running a longitudinal study.

This will ensure that you only pay for full submissions from participants who meet your screening requirements.

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