In the fall of 1971 the Supreme Court's Advisory Committee presented to the Court the Proposed Federal Rules of Evidence. The Committee failed to include a rule on impeachment by bias, interest, or prejudice. In failing to include such a rule, the Committee bypassed the opportunity to reconcile a conflict over both the content and methodology of this form of impeachment. The authors, in an attempt to show the need for a rule dealing with bias impeachment, analyze the present decisional conflict in this area. They conclude by proposing a rule designed to add some uniformity to this highly persuasive method of impeachment.