Set case closing conditions
You can set conditions that must be met before a case can be closed
You can specify a survey that must be completed before the case is allowed to be closed
Steps
Go to the Project Preferences page of the project that the cases are part of
Tick the box Set conditions for cases to be closed
This causes a Choose form dropdown list to appear
Choose the survey that must be completed before the case can be closed
Scroll to the bottom and press Save