Ch a p t e r. I n t r o d u c t io n This chapter gives a brief description of the problems considered in this book and the key results presented in each chapterl 212 WhatThiSB CQ ISAbat This book is about some basic robust and H control theory1 We consider a control system with possibly multiple sources of uncertainties2noises2and disturbances as shown in Figure 3131 uncertainty disturbance other controlled signals uncertainty System Interconnection uncertainty tracking errors noise controller reference signals Figure 313:General System Interconnection 3Chapter Introduction This chapter gives a brief description of the problems considered in this book and the key results presented in each chapter ￾￾ What This Book Is About This book is about some basic robust and H￾ control theory We consider a control system with possibly multiple sources of uncertainties noises and disturbances as shown in Figure  controller reference signals tracking errors noise uncertainty uncertainty other controlled signals uncertainty disturbance System Interconnection Figure  General System Interconnection