Abuse of discretion occurs when a court does not apply the correct law or if it bases its decision on a clearly erroneous finding of a material fact. A court may also abuse its discretion when the record contains no evidence to support its decision. Abuse of discretion is one of the reasons a court of appeals may use to reverse the trial court judgment.
A judge may be found to commit an abuse of discretion by not allowing an important witness to testify, making improper comments that might influence a jury, showing bias, or making rulings on evidence that deny a person a chance to tell his or her side of the matter. In criminal cases abuse of discretion can include sentences that are grossly too harsh. In a divorce action, it includes awarding alimony way beyond the established formula or the spouse's or life partner's realistic ability to pay.