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"(...) the interface is the place where information moves from one entity to another, from one node to another within the system."

— R. Galloway, A., 2012. The Interface Effect. 1st ed. Malden, USA: Polity Press..

"Since any given format finds its identity merely in the fact that it is a container for another format, the concept of interface and medium quickly collapse into one and the same thing."

— R. Galloway, A., 2012. The Interface Effect. 1st ed. Malden, USA: Polity Press..

"The interface is this state of being on the boundary."

— François Dagognet, Faces, Surfaces, Interfaces (Paris: Librairie Philosophique J. Vrin, 1982), 49·

"A plastic user interface preserves usability if the properties selected at design time to measure its usability are kept within a range of values as adaptation occurs to contextual changes."

— Calvary, G., Coutaz, J., Thevenin, D., Souchon, N., Bouillon, L., Florins, M, Vanderdonckt, J. and Limbourg, Q., 2002. Plasticity of User Interfaces: A Revised Reference Framework. 1st ed. Bucharest, Romania: TAMODIA. 1·

"The Platform Model and the Environment Model define the contexts of use intended by the designers. For example, the size of the screen would be described in a platform model, whereas the level of noise of a room would be captured in an environment model."

— Plasticity of User Interfaces: A Revised Reference Framework, 3·