In Frame semantics, a semantic frame is defined as a coherent structure of concepts that are related such that without knowledge of all of them, one does not have complete knowledge of one of the either, and are in that sense types of gestalt. Frames are based on recurring experiences. Frames are evoked, among other things, by words as the semantic conceptual content of the word activates the frame of encyclopaedic meaning that is needed for the understanding of that word. Frames are used in computational linguistics and also in research into Augmentative and Alternative Communication.