Meaning that a usability test measures if an interface meets the goals it sets, but only test what is present. How do I know when an interface is complete? Meaning a test, or measure of completeness, fitness, etc.
NOTE: If you can't think of an answer, please at least post an answer of a complete interface component, and why it's complete based on your experience.
If you have questions, just ask -- thanks!
Answer
The minimalists would say "when there is nothing left to remove" :-)
Ok, Now seriously, an interface is complete when is satisfies all the goals you set for it - so if you don't have measurable goals you can't measure completeness - after all you can't measure fitness without knowing what you are supposed to fit to.
A good example of goals would be: "enable the user to do X, Y and Z in less than 1 minute with a 90% success rate", than all that's left is to get users to sit in front of the computer and ask them to do X, Y and Z if more than 90% are able to perform all tasks in less than a minute you are done.
Another good examples are "increase conversion rate by 50%" or "reduce customer abandonment by 10%" etc.
A bad example is "increase conversion rate", in this example you can never declare the interface complete - there will always be more options to test and tiny improvements to perform.
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