This book constitutes the proceedings of the 9thInternational and Interdisciplinary Conference on Modeling and Using Context,CONTEXT 2015, held in Larnaca, Cyprus, in November 2015.The 33 full papers and 13 short papers presented werecarefully reviewed and selected from 91 submissions. The main theme of CONTEXT2015 was "Back to the roots", focusing on the importance ofinterdisciplinary cooperations and studies of the phenomenon. Context, contextmodeling and context comprehension are central topics in linguistics,philosophy, sociology, artificial intelligence, computer science, art, law,organizational sciences, cognitive science, psychology, etc. and are alsoessential for the effectiveness of modern, complex and distributed softwaresystems.CONTEXT 2015 embedded also a Doctoral Symposium, andthree workshops; Smart University 3.0; CATI: Context Awareness and TactileDesign for Mobile Interaction; and SHAPES 3.0: The Shape of Things.