SurveyLab works with any survey panel. Thanks to the "Response ID" mechanism system can identify respondents and thanks to screening parameters it knows who has completed the survey and who hasn't met selection criteria.
SurveyLab and the panel exchange only information about "Response ID", so respondent data is always secure and confidential.
Available screening parameters :
All redirection parameters can have individual survey completion link (URL).
NOTE. The system counts screen-outs as completed surveys. Therefore we recommend that you will track survey progress and update quota as your project advances.