Discover the possibilities

Help, Inspirations & Videos

How do I prevent a participant from participating more than once?

Setting: Single or multiple participation allowed

In the settings of each survey you can decide whether multiple participation is allowed or not. If multiple participation is not desired, set the answer to “only one participation per computer”.

You have two options for this function:

Cookie blocking: With cookie blocking, a cookie is stored in the browser with which the participant opens the survey. This cookie contains the survey ID and is matched when the survey is called up again. If the participant has completed the survey – reaching the final page – a new participation is not possible and the participant sees a message that he has already participated.

IP Blocking: IP blocking works exactly like cookie blocking, except that the IP address is read, converted to a non-encrypted hash and only then saved. When the survey is called up again, the hash is compared and a new participation is not possible if the survey has already been completed.

However, both mechanisms are bound to the end device (computer, smartphone, etc.). As soon as a participant changes the “location”, the device or, in the case of cookies, the browser, the person/participation on another device can no longer be recognized and the person could participate again.

But keep in mind: Usually people use the same device on which the survey will start and end.

And in addition, ask yourself how high the probability is that a person tries with “all his might” to identify the locks in order to get around them.

E-mail invitation tool

When you invite people to your survey via the easyfeedback e-mail invitation tool, each participant receives a unique link that is only valid once. This has two advantages:

  1. You can exclude multiple participation, as the automatically generated survey link is only valid once.

  2. The participant can change the device or location and continue or complete the survey from there.
    This is possible because each participant receives a unique link. The previously described options “single or multiple participation” are no longer relevant in this case, since the functionality is exclusively controlled by the unique link.

This is possible because each participant receives a unique link. The previously described options “single or multiple participation” are no longer relevant in this case, since the functionality is exclusively controlled by the unique link.

Individual access codes for participation

As a third option, you can only allow participation in the survey using access codes. Access codes work in the same way as the unique links in the email invitations:

  1. Each access code is only valid once. After participation, the access code cannot be used a second time.

  2. Access codes can be recognized across devices and locations. The participant can interrupt the survey at any time and continue it at another location.

  3. If you create and export the manual access codes, you can prevent multiple participation even without the easyfeedback e-mail invitation tool and you will not have any customer or employee e-mails stored with easyfeedback.

Food for thought

In conversations with our customers, we often hear concerns that people might participate more than once and thus distort the results, or that employees might be used as a “channel” to let off “steam”.

Before you put a lot of energy into the “safe” implementation of your survey, ask yourself how high the probability will be. Do my customers or employees have “time & desire” to fill out a survey more than once? From when/how much “multiple participation by one person” does this influence the result?

Your concerns are correct, but from experience we can tell you that this almost never happens.

And if a person wants to falsify the result, he or she must summon up “criminal energy”. On the one hand, the person must first find out how the locks work, and on the other hand, he or she must invest time to “significantly and unobtrusively” falsify the result.

And if you do feel that the results have been influenced, then take a look at the participation time. If the average is about 10 minutes and participation was achieved several times in 2-3 minutes, then you will recognize the “wrong” information very quickly.

Best informed? Start your survey now