Mendoza et al. (2009) introduced a coin rotation task as a convenient test of motor dexterity. It involves timed completion of twenty 180° rotations of a nickel using the thumb, index, and middle fingers. The results from this task are compared with the results of two widely used tests of motor dexterity: the finger-tapping task and the Grooved Pegboard task. What empirical way of assessing construct validity is being used?