The third edition of Control Systems: Principles and Design provides a unified treatment of continuous-time and discrete-time systems for two courses at the undergraduate level. The text continues to emphasize on frequency-domain design methods augmented with state variable methods for control systems analysis. Key Features: Integrated coverage of continuous-time and discrete-time systems. Suitable for two courses on control systems at the undergraduate level. New chapters on: Digital Control Systems (Ch -11) Nonlinear Systems (Ch - 14) State Variable Design (Ch - 13) Emphasizes on the frequency-domain design methods using root locus and Nyquist/Bode/Nichols plots. Comprehensive coverage on compensator design (chapters 7 & 10) Chapter based MATLAB modules on the books website New to this edition New! Chapter on Digital Control System (chapter 11) New! Chapter on Nonlinear Systems (chapter 14) New! Chapter on State Variable Design (chapter 13) Chapterbased MATLAB modules on the books website Total of 633 problems Solved examples - 230 Theory review questions - 100 Exercise problems - 303 Integrated coverage of continuous-time and discrete-time systems. Suitable for two courses on control systems at the undergraduate level. New chapters on: Digital Control Systems (Ch -11) Nonlinear Systems (Ch - 14) State Variable Design (Ch - 13)