Non Identifier Based High Gain Adaptive Control Over the last decade the field of adaptive control where no identification mechanisms are invoked has become a major research topic. This book presents a state of the art report on the following more specific area: the system classes under consideration contain linear (possibly nonlinearly perturbed) finite dimensional continuous time systems which are stabilizable by high gain output feedback. The properties of minimum phase systems and strictly positive real systems are studied in their own right. These results are applied to design simple adaptive controllers involving a switching strategy which is mainly tuned by a one parameter controller based on output data alone. Control objectives are stabilization tracking tracking and servomechanism action. In addition robustness with respect to nonlinear perturbations and performance improvements are investigated