The Air Traffic Selection and Training (AT-SAT) test battery is the Federal Aviation Administration�s (FAA�s) recently developed computerized selection test for Air Traffic Control Specialists (ATCSs). Only one form of the AT-SAT battery was developed as part of the initial development and validation effort, meaning that all people who take the test receive the exact same items. The goals of the current study were to: 1) determine if repeated test taking improves performance; 2) determine if coaching improves performance; 3) identify specific tests within the AT-SAT battery that are most susceptible to practice and coaching effects; and, 4) determine the extent to which practice and coaching effects potentially impact hiring decisions.