Human behaviour is a very important phenomenon, but it is also as complex as it is important. Human behaviour is responsible for good and bad happenings, for successes and failures, for inventions and discoveries, for accidents and mishaps, for love and care, for hatred and violence, for development and progress, for destruction and backwardness and so on. Human behaviour affects individuals, families, societies and nations. Experts have given a few theories but still the world is full of agonies caused by irrational or unexplained behaviour of many people. It appears that the existing theories are inadequate or incomplete in explaining human behaviour. This book attempts to fill up this void.