Ensuring control accuracy This monograph presents original methods of analysis and synthesis for a wide class of control systems with required accuracy. The direct interaction between those methods and classical frequency domain methods is demonstrated as well as its importance for the investigation of automatic control systems quality. This clearly and thoughtful written book is aimed at control engineers practitioners such as system designers or designers of automatic control devices as well as researchers in control theory. Ensuring Control Accuracy is also a useful textbook for graduate students carefully simplifying the understanding of the field including instructive questions at the end of each chapter. TOC:Main concepts and definitions. Formalization of dynamic system investigation problems. A priority information obtainment and analysis on input actions and its derivatives. Robust Wiener filtering. Analysis of control error dispersion on numerical characteristics of actions. Use of canonical presentations for sequence of spectral density moments. Analysis of maximal control error. Synthesis of control systems with preset ensured operation accuracy. Optimization of control systems on criterion of highest ensured accuracy. Digital robust systems