In XP we turn all the dials up to 10, not up to Reasonable.

~ RonJeffries

Ward Cunningham being asked about XP:

- Well, your own work. Do you use it?
- Of course not, not always. Well, keep in mind that if you don't try different ways to do things how would I ever come up with XP? The computer is so powerful that you have to keep trying ways that can work.

On-site costumer

Managers will have to decide which is more valuable - having the software working sooner and better or having the output of one or two people. If having the system doesn't bring more value to the business than having one more person working, perhaps the system shouldn't be built.

-- Kent Beck

Choose the simpler design

If a programmer sees a one-minute ugly way to get a test working and a ten-minute way to get it working with a simpler design, the correct choice is to spend the ten minutes. Fortunately, you can make even radical changes to the design of a system in small, low risk steps.

-- Kent Beck

Why do you code, test, listen and design?

"You code because if you don't code, you haven't done anything.
You test because if you don't test, you don't know when you are done coding
You listen because if you don't listen you don't know what to code or what to test.
And you design so you can keep coding and testing and listening indefinitely.
That's it."

-- Kent Beck