An automatic control system that preserves its operational capacity in conditions of unforeseen change in the properties of the controlled system, the control objective or the environment by changing its operating algorithm or seeking optimal states. All living organisms have a highly developed ability for adaptation. Many current automatic control systems also have certain adaptive and self-optimizing capabilities. Depending on the adaptation methods used, self-adaptive systems are classified as systems of self-alignment, self-learning and self-organization. As of 1975, self-alignment systems were the most used.