Working with the Check Feature 

A check is a set of statements intended to provide the user with a clue as to whether certain conditions are fulfilled or not. A check does not modify the document it is applied to.  A check is a feature. In the document specification tree, it is displayed as a relation that can be activated and deactivated. Like any feature, a check can be manipulated from its contextual menu.

Creating a Check
Using the Check Editor
Performing a Global Analysis of Checks
Using the Check Analysis Tool
Using Rules and Checks in a Power Copy
Creating Sets or Relations
Updating Relations using Measures