How do you verify that users' requirements are addressed in the code you're working on?

Question

Code can be perfect, and also perfectly useless at the same time. Getting requirements right is as important as making sure that requirements are implemented correctly.

How do you verify that users' requirements are addressed in the code you're working on?

Answer 1

You show it to the users as early and as often as possible.

Chances are that what they've asked for isn't actually what they want - and the best way of discovering that is to show them what you've got, even before it's finished.

EDIT: And yes, this is also an approach to answering questions on StackOverflow :)