A vertical timeline would have several advantages:

  1. Users much prefer vertical scrolling.

  2. Labels would align with events instead of stretching over unrelated time 
intervals.

  3. The hierarchy of events in bands at different time scale could be made 
visually clear.

  4. Because of screen proportions,there is more horizontal space than vertical 
space. The width of text components needs to be constrained anyway, for 
usability reasons.

>From earlier discussion, it appears that the main concern was with arrangement 
>of labels in bands that get narrow as new bands are added. Perhaps the number 
>of vertical bands can be constrained, or application creators can exercise 
>self-control. Are there significant technical issues in adding the VERTICAL 
>option?

Alexander Nakhimovsky
Computer Science Department
Colgate University Hamilton NY 13346
  http://cs.colgate.edu/~sasha
Director, Project Afghanistan
   http://www.colgate.edu/projectafghanistan

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