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Acknowledge completion of the first task you can, even if quite trivial. At latest, respond at the end of the first survey questions page—usually the demographics questions.
This acknowledgement motivates the participant to keep going, and subsequent acknowledgements along the way reinforce that. My personal fav is a progress bar style which shows my completion percentage going up as I progress. An extra-special 'woohoo' for ¼, ⅓ or ½ completion should help.
Source
This is probably a variation on proven upselling techniques in retail.
Acknowledge completion of the first task you can, even if quite trivial. At latest, respond at the end of the first survey questions page—usually the demographics questions.
This acknowledgement motivates the participant to keep going, and subsequent acknowledgements along the way reinforce that. My personal fav is a progress bar style which shows my completion percentage going up as I progress. An extra-special 'woohoo' for ¼, ⅓ or ½ completion should help.
Source
This is probably a variation on proven upselling techniques in retail.