These factors are of great importance when it comes to the human behavior. (İnsan davranışları söz konusu olduğunda bu faktörlerin önemi çok büyüktür.).
When it comes to cars, I like GM. I would buy a Chev or a Pontiac.
... I know when it comes to mobile phones, everyone in here is ...
... And by the way, this is not just when it comes to individual taxes. ...