Researchers have begun to recognize that because Type A and Type B behavior patterns represent pervasive lifestyles, they may have general implications for various psychological phenomena. One area of interest concerns the influence of Type A and B behavior on the quality and functioning of interpersonal relationships. A study was conducted to investigate the influence of Type A and B behavior by members of dating couples on their relationship satisfaction, commitment, and long-term intentions. Thirty-one dating couples, all university students, completed questionnaires measuring Type A or B behavior patterns, partner's behavior patterns, quality of relationship, and dating history. Subjects also completed four biweekly questionnaires measuring conflict and conflict resolution, attribution of blame, quality of communication, and relationship satisfaction and commitment. Results indicated that partners with contrasting behavioral orientations were more committed to their relationships, and had higher intentions to marry their partners, than did couples where partners had similar behavior styles. One contributing factor to this difference appeared to be the manner in which couples resolved conflict. Couples with contrasting behavioral styles were less likely than couples with similar behavioral styles to use a confrontational style of conflict resolution. Type A females were more likely than Type B females to blame partners for relationship conflict, suggesting that the Type A self-serving bias may be disruptive in interpersonal relationships. (Author/NB)