OTRS: How survey module works?

There are no steps given anywhere about how survey module works.
Here are the steps given,
1. Download and install Survey module
2. Login as OTRS Admin i.e. root@localhost by default.
3. Navigate to SysConfig setting under "Misc" section.
4. Search for Survey, then go to Core -> Survey::SendPeriod.
5. Change this value to 0, to send mail always whenever agent close the ticket.
6. Also created survey should have status as "Master". This is the setting when you create the survey.

This is where you can find more details, this post is translation from German.
http://translate.google.com/translate?hl=en&sl=de&u=http://wiki.otrs-forum.de/index.php%3Ftitle%3DSurvey&ei=3VWxSdOZCozMmQeRxJjfBQ&sa=X&oi=translate&resnum=8&ct=result&prev=/search%3Fq%3DSurvey::SendPeriod%26hl%3Den%26client%3Dsafari%26rls%3Den-us%26sa%3DG