In this book Rune Pettersson presents one internal information design theory, and six external information design theories with more than hundred facts, hypotheses, and postulates. The internal theory, called infology theory, is based on research within the academic discipline Information Design.
The six external information design theories are based on research in supporting sciences. These theories are called Aesthetics theory for ID, Facilitating theory for ID, Communication theory for ID, Providing theory for ID, Information theory for ID, and Language theory for ID.