Parallel sets
From WikiViz
Parallel sets is a method for the visual analysis of categorical data. It adopts the layout of parallel coordinates, but substitutes the individual data points by a frequency-based representation.
For more details, see the dedicated web page: http://www.vrvis.at/via/research/parsets/index.html
Or the InfoVis paper: http://www.vrvis.at/via/research/parsets/paper.pdf
