Question: What information about an attribute is most important?

Hey, IPP developers – we have a question for you.

Our team in IPP is doing some design work to make the entity reference pages (like this one for BillPayment) easier to learn and use. Designing an entity page is all about organizing the attribute information so it’s easy to skim through and find what’s important. But within our own team, we had different beliefs about WHAT’s most important for an attribute– the description? The data type and qualifiers? The validation rules? So instead of arguing amongst ourselves, we want to hear from you.

So:
What information about an attribute is most important? What does your eye go to first? What do you look up most? Does it depend on what you are trying to do? Tell us about it.