The defense attorney may bring in expert testimony on the battered woman syndrome to establish self-defense. An understanding of the syndrome's symptomology is essential to evaluate the admissibility of such testimony in the trial of battered women who kill. The battered wife syndrome is a psychosocial theory explaining the unique combination of psychological stresses resulting from the deliberate and repeated infliction of physical abuse. Battered women generally have low self-esteem, accept responsibility for the batterer's actions, suffer from guilt, present a passive face to the world, have severe stress reactions, have traditional values about home and family, and believe that no one can resolve the predicament except themselves. In relating these symptoms to self-defense, the defense must prove that the defendant had a bona fide belief that she was in imminent danger of death or grave bodily harm and that the only means of escape from such danger was through the use of deadly force. Existing case law dealing with the battered wife syndrome indicates that expert testimony is permissible if the expert's qualifications to testify are established. Expert testimony is necessary for jury members to understand the unique fears of a battered woman and to understand that the battered woman syndrome is the product of a recognized scientific methodology. The probative value of expert testimony on the battered woman syndrome outweighs any prejudicial impact. 144 references.