Divorce can happen for many reasons, either because the parties fell out of love or generally do not see eye to eye on various issues. That is partly what makes the divorce process emotional and sometimes difficult or contentious. There are many issues that need to be resolved during an Illinois divorce, and therefore there are plenty of issues to disagree about.
However, discord doesn't always have to be the case. The couple can use mediation and other tools to attempt to reach an agreement. Both parties may not be completely happy with the outcome, but often times it is better than presenting all the issues to a judge and being bound by whatever is decided by a third party.