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In interactive layout a drawing is repeatedly modified either by the user or by the assistance system. A usability requirement states that the assistance system should alter the layout such that the user's mental map is preserved. This work concretises mental map preservation from a cognitive science perspective. A notion of similarity that is based on the idea of transforming spatial mental models serves to measure the user's cognitive effort needed for orientation in the changed layout.dblp:journals/ki/Hagen08 fatcat:bb37cahez5bgxo6wmjoam6vlae