Archive for April 25th, 2007

Just do it

A good user interface does what the users asks. The user shouldn’t have to fight the computer at every step. They want the computer to do something, so just do it.

In this example, we are awarding a contract to a supplier. After selecting a supplier, the user pushed the toolbar button:

tbawarditem.png

 Rather than awarding the item, the user is presented with a rather unfriendly error message:

Not very helpful

This isn’t very helpful. The user asked to award a contract to this supplier. She did not ask if it was already awarded to someone else. She isn’t even given a hint by the software as how to proceed. At least we could be helpful and tell her who the other supplier is:

dialoglesshelpful2.png

But we’re not really accomplishing what the user asked. If there is no way for her to award the item, then she should not have been able to reach this “error” condition in the first place:

badbetter.png

Disabling the toolbar button makes it clear that what she wants is just not possible. Rather than being led to believe they can award an item, and then having the rug pulled out from under them – it’s understood from the beginning that they can’t. But there’s still a better way.

If the user is allowed (i.e. there is a process, and they have permission) to unaward contracts from one supplier, and give them to another, then do so. The user wants it done, so just do it:

dialogmorehelpful.png

This way everyone’s happy.

  • the computer does what the users asks
  • the computer is satisfied that it has given the user fair warning; that the user might be making a mistake
  • the computer is forced to do the grunt work, which computers are good at
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