Het effect van premiedifferentiatie op de intentie om te stoppen roken

SurveyCircle is based on honest mutual support.

Please note: SurveyCircle has clear rules for everyone. We take consistent measures to protect the community against rule violations and use automated and manual checking procedures to do so.

Rule #1: Fill out all questionnaires truthfully and conscientiously (i.e. take your time to fully comprehend questions and possible answers, to read scenario descriptions, to fill in text fields, etc.).

Rule #2: Participate in studies only when you meet the participation criteria.

Rule #3: Redeem Survey Codes only if you have earned them in compliance with the rules.

Rule #4: Redeem Survey Codes directly after completing a study.

Rule #5: Rate the quality of studies objectively and in a differentiated way.

Rule #6: Do not share Survey Codes with others.

Rule #7: Do not use multiple user accounts.

Rule #8: Do not let anyone use your user account to participate in studies.

Rule #9: Do not use rule violations by others to your advantage.

Thank you for helping us to ensure the quality of the Survey Ranking!

Issue found:
The link to the study appears to be broken.

Thank you for helping us to ensure the quality of the Survey Ranking!

Issue found:
The study has already been closed.

Thank you for helping us to ensure the quality of the Survey Ranking!

Issue found:
There was no Survey Code at the end of the study.

Note: In some cases, the Survey Code is shown already on the first page of a questionnaire or in the "pop-up" menu of the study in the Survey Ranking.

Thank you for helping us to ensure the quality of the Survey Ranking!