User Interfaces

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Computers are symbol processing machines. Hence, symbol based user interfaces are most general and powerful. However, the current trend is to focus on graphical user interfaces that predominantly use index-based communication (pointing with a mouse) and icon-based communications (icons) [1]


  1. "Semiotics and GUI Design" (a.k.a. "Excessive Realism in GUI Design: Helpful or Harmful?") by Gene Callahan does not seem to be available online anymore (two links that are currently stale are and