Delaying payments for a long longitudinal study

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. 

Please specify that payments will be delayed until completion of all parts in your study description, so that participants are fully aware of the requirements in advance of agreeing to take part.

If the waves are over a longer period all participants from the each stage will need to be approved within 21 days. See "Minimising dropout / attrition rate in longitudinal studies" for other ways to incentivise participants. 

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