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I think you have it backwards, usability is the goal and effective
organization is a primary strategy used to achieve it. So is user task
My .02 on a very worthwhile discussion.
From: Anthony Markatos
Also, remember that the primary element of usability is effective
organization. Ideally, the product should be organized around end-user
tasks. Granted, you do not know the users yet, but as a "quick and dirty"
analysis, evaluate the extent to which you have to skip-around or jump-over
material to accomplish what seems to be a logical end-user task.