This session will discuss the responsibilities of the base umpire(s), including different positioning based on the number of base runners and evolving situations; and the responsibilities of the field or base umpire in a two-umpire system. Highlighted in the presentation will be examples of the proper footwork used by base umpires to achieve proper position for calls. Video and slide presentations, along with supporting commentary by the presenters will illustrate several common calls made by the base umpire(s).