A Modern Cryptography of Change and Development in Human Systems mainly applies the recent theories of chaos and fractals to analyze and realize the complex systems evolution phenomena; and to reveal the secrets of apparently mysterious processes of change and development in human systems as an example of complex systems. It is attempted to introduce the theories of chaos and fractals; and the course of analysis, in a simplified approach; such that high school or pre-university mathematics would suffice to understand and appreciate the cryptography of change and development within a society. Especially vital in a developing country, It is hoped that the book can serve people to realize and appreciate a scientific fact that the phenomena of underdevelopment and development roots deeply in their own society and not outside; and hence, instead of meaningless projections, try to improve their own contributions towards change and development.