The general context of this book is applied to systems in n-dimensional space. Emphasis is placed on a general approach to control theory, independent of optimization, and demonstrates a novel approach by converting a given dynamical system into a control system, in order to obtain a deeper understanding of its mode of action. Contents of the monograph include a presentation of the basic concepts and results of control theory, the typical and classical behaviour of control systems, techniques for transforming dynamic systems into control systems, and the systematic approach to study control systems in applications, as shown in many examples.