After resolved a ticket, usually we might want to send a survey to user so that they can feedback how's the IT support handle the case. In this case, the survey is important for the evaluation.
In Service Manager 2012, you may configure the survey easily follow the article from Travis Wright.
http://blogs.technet.com/b/servicemanager/archive/2009/12/08/incident-resolution-satisfaction-surveys-on-sharepoint.aspx