When you are due to complete a survey, you will periodically receive these emails as a reminder to finish the survey. Once all outstanding surveys are completed, you should not receive any more emails until the next set of survey(s) become available.
Alternatively, some programs or studies may require you to complete more than one survey. If there is more than one survey available for you to complete, you will receive an email for each outstanding survey. The emails will have different subject headings and will contain different sets of login information. Please review the contents of the emails carefully and ensure that you have completed the corresponding survey prior to deleting them.