Looking for ways to motivate people to complete your online survey?

This is easily done. You can create two surveys -- the first survey is for your data collection.

When a respondent completes the survey successfully, you can pass their survey ID along to a second survey. The second survey can only be responded to if surveyID from the first survey is provided.

In the second survey, you ask the questions you require for the contest.

When you do your draw, you can double-verify that the winner completed the survey by validating the respondents surveyID against your first survey!