If your divorce is even slightly more complicated than a divorce where both parties agree on virtually everything, then you may need witnesses during the divorce process. One of the top reasons for a witness would be when one party calls in a third party as a character witness. A character witness is someone who knows you well and can speak to your overall character.
If your spouse is questioning your morals, ethics, or level of responsibility during the allocation of parental responsibilities, you may need one or more character witnesses. If you are making certain allegations against your spouse, then you might also call witnesses to support those allegations. For example, if you claim your wife is an alcoholic, you might call witnesses who have firsthand knowledge that the claim is true.