1. A method for controlling a speech recognition system, the method comprising: monitoring adaptive feature data about interactions between a user and the speech recognition system; determining, via an adaptive controller, a first group of samples of the adaptive feature data; creating, via the adaptive controller, a control chart based on the first group of samples, the control chart including a control limit; determining, via the adaptive controller, a second group of samples of the adaptive feature data after creating the control chart; calculating, via the adaptive controller, an arithmetic mean of each sample of the second group of samples to determine a sample mean; comparing, via the adaptive controller, the sample mean to the control limit in order to identify unexpected performance of the speech recognition system; and if the unexpected performance is identified, then adjusting the speech recognition system based on the identified unexpected performance.