How to prevent Duplicates? Ballot Box Stuffing? | XM Community
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Hello,
I would like to conduct a large survey among our customers.
In order to reach as many customers as possible, I would like to use different recruitment channels (newsletter, website, social media).
 
Since it can happen that one customer is contacted via several channels and I do not want that customers participate more than once (there will be a lottery at the enf), I need to detect duplicates. Through Qualtrics this is possible via "Ballot Box Stuffing".
Is it true that Ballot Box Stuffing only checks the browser cookies and not the IP address?
Are there any other possibilities to prevent duplicates? 
I don't see unique links as a possibility because of the different recruitment channels. 

Thanks!
Maria

Yes, prevent ballot box stuffing uses cookies. Duplicate IP addresses don't necessarily mean it is the same person. It could be different people accessing the Internet behind the same firewall (a company, university, etc.).
If you have emails for all your customers, you could use an Authenticator using email address.
If you want to limit by IP address you can use web services and an external database to record and check IP address.

Can you explain me more about the "web services and external database" to record and check IP adress?

Does exist some templates to record and filter the same IP adress?

We need to prevent it, that someone can take the survey with an already existing IP adress.

Regards
Markus

https://www.qualtrics.com/community/discussion/comment/30320#Comment_30320There isn't a template. You'll have to write a web service script to record and check IP addresses.

Why Qualtrics offer that option? They can record the ip but no OPTION to block same IP's...Why we have to script something else separatly. i dont understand!

https://www.qualtrics.com/community/discussion/comment/30327#Comment_30327As I said above, a duplicate IP isn't necessarily a bad thing. Qualtrics has other, better Fraud Detection capabilities (mostly at an additional cost).

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