What can be extra frustrating than shedding a recreation as a result of a catcher received crossed up and missed a pitch as a result of he thought the fastball was being thrown and was stunned by the curve ball? Or losing a game because an infielder throws the ball away when throwing to a base where he had no probability of getting the runner anyway? These are just two examples of breakdowns in communication.
There are several strategies used to alter alerts with runners on base, however the easiest and easiest is for the catcher to implement an Indicator sign. What this implies is the signals for the fastball, curve and change up stay the identical, however the catcher will flash an indicator signal, say a faucet on his left thigh, which means the next sign will indicate the pitch he needs thrown.