The book presents the latest research on the theory, models and applications of complex systems in knowledge-based environment. The amount of information is increasing at an exponential rate. Thus, our systems are getting complex day by day. For example the world wide web carries practically infinite information. The real challenge is to reinvent theory to deal with complex systems. The provisional contents in this book will be based on the theory and practical applications of complex systems in knowledge-based environment. The contents will be based on but not limited to: - Advanced Knowledge-Based paradigms in complex systems; - Information models and architectures of complex systems; - Intelligent agents in complex systems design; - Multi-media systems and practical applications.