Be skeptical about (software development) estimates

Really like this article, which concludes...

"If someone gives you an estimate for project duration, ask them the following questions:

1. Was this estimate made by the team which will actually be doing the work?
2. How long has this team worked together?
3. Has this team measured their own actual capacity and used that measurement for this estimate?
4. How well does the team know the domain and tools to be used?

If the answers to these questions are unsatisfactory, then the estimate is pure fantasy, it is a lie."