Rules provide a proactive mechanism for you to be alerted when certain grid quality criteria you set are no longer met.
The Rules panel can be accessed from Examine, Rules as shown in the image below.
Tip: Use the Rules command to create new rules for quality criteria pertaining to your specific CAE solver. This will allow you to easily verify your mesh quality at any time with the push of a single toolbar button.
For more on Rules, choose an option below: