The book deals with modern control theory based on state variables and state space. It gives a basic approach to the design and analysis of continuous time control systems using state space representations. The entire text is divided into ten chapters. The content of each chapter is well explained and many worked out examples are included to reinforce the theory. Each chapter ends with a summary of subject matter discussed. Many practice problems and review questions are included that enable the students to test their understanding of the subject. Illustrations are included for a better understanding of the theoretical concepts. Appendices supplement the text. The book presents the theories and explanations in a simple and lucid manner that help the students to learn and imbibe the concepts without much difficulty. It will cater to the needs of the students pursuing BE/BTech courses in electrical and electronics engineering and electronics and communications engineering.