The four categories of Impeachment that the Litigator has available to call a Hostile's testimony into question are Accuracy {1}, Bias {2}, Capacity {3} and Dimishment. These are the "ABC/Ds" of Cross. The first three categories (A,B and C) are directed toward eroding the convincing force of the Hostile’s testimony about the Facts in order to frustrate the OC’s burden of Persuasion. The fourth category (the /D) is aimed at the Hostile’s character for truthfulness rather th