This text is part of a three-volume set that provides a comprehensive and detailed reference on non-linear systems. Written by a group of leading experts in the field drawn from industry, government and academic institutions, it provides both a firm theoretical base and extensive practical examples and advice for engineers working with non-linear systems. The book focuses on the physical meaning of the concepts introduced and holds the level of mathematics to the minimum necessary. Simulations and industrial examples drawn from aerospace, mechanical, electrical and chemical engineering are given throughout. The book is divided into three separate volumes. The first covers modelling and estimation. The second volume deals with stability and the final volume with control. This book should be of interest to engineers and researchers in control, whether in electrical, mechanical, chemical or aerospace engineering.