Inf@Vis!
The Digital Magazine of InfoVis.net

Consistency. 

Consistency: Each series must maintain its colour, texture or, in the end, its codification. Click on the image to enlarge it. Source: graph made by the author

Consistency is important in whatever type of graphic, especially if it takes part in a presentation or a set of graphics appearing together in a panel or on the same page. It implies compliance with a rule, essentially of codification. The same colours or textures should mean the same across the representation.

• Code the bars of the same data series or corresponding elements always in the same way in what regards to scale, colours and textures. This is something that most graphic programs generating bar charts do, but remembering it doesn't harm.
  
  

• Place the bars corresponding to the same concept always in the same manner. 
  
  
• Don’t emphasize some bars in detriment to others if they are of the same data series. 

Spatial Contention...

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