The purpose of this book is to help readers and organizations improve their ability to manage the properties and characteristics of the systems they create and/or operate. The book discusses the use of systems thinking to analyze the properties and characteristics of the functioning of various systems. The principles of systems engineering are described, including systems life cycle management. Particular attention is paid to the joint use of the systems approach and systems engineering to develop the ability to think and act in the language of systems. The presentation is illustrated by numerous examples. The book will be useful both to specialists involved in the creation of complex engineering, socio-technical and organizational systems, as well as students and graduate students in engineering, technical and managerial areas of training, as well as persons interested in the problems of creating complex systems.