Insight on managing a software project

Joel on Software - The Iceberg Secret, Revealed

You know how an iceberg is 90% underwater? Well, most software is like that too -- there's a pretty user interface that takes about 10% of the work, and then 90% of the programming work is under the covers. And if you take into account the fact that about half of your time is spent fixing bugs, the UI only takes 5% of the work. And if you limit yourself to the visual part of the UI, the pixels, what you would see in PowerPoint, now we're talking less than 1%.

That's not the secret. The secret is that People Who Aren't Programmers Do Not Understand This.