However, if your study consists of multiple waves you can wait until the final wave is complete before paying each wave provided that the waves are within 21 days. 

If the waves are over a longer period all participants from the first stage will need to be approved. In order to incentivise participation please consider 1) Using participants who have completed at least 10 studies on Prolific before (these will be more likely to be engaged) 2) give bonus payments to participants who complete all stages. 

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