This article describes some of many definitions of information design. Practical as well as theoretical aspects are important in information design. It is an applied science. We may view information design, as a “combined discipline,” as a “practical theory,” or as a “theoretical practice.” As an academic discipline, Information Design needs to incorporate theoretical contributions from other disciplines. The principles of information design are universal, and they are not tied to any unique features of a particular culture or language. One internal and six external information design theories are mentioned. Principles become the fundamental sources for development of practical guidelines.