Croatian Interdisciplinary Society is a non-governmental organization operating in Croatia. Croatia (Hrvatska ˈxȓvatska officially the Republic of Croatia ( Republika Hrvatska) is a southern Central European country at the crossroads between It acts to promote interdisciplinary education and research, primarily but not exclusively in the domain of complex systems. In Academia, Pedagogy, Physical sciences, Earth sciences, Human sciences and Social sciences Education encompasses both the Teaching and Learning of Knowledge, proper conduct, and technical competency Research is defined as Human activity based on Intellectual application in the investigation of Matter. This article describes complex systems as field of Science. For other meanings see Complex system.