Simplicity

• Do everything the simplest way imaginable.

• Don't add functionality before it's needed. 

• Refactor code whenever and wherever possible.  (Remove redundancies, clean up ugliness)

• Leave systematic performance optimization until the end-  it may not be needed

Consistency

• Collective code ownership. Any team member can make changes to any piece of code

• Code must be written to agreed stylistic standards.  (Unimportant which standard, just that there is one that everyone uses.)

• Move people around- avoid islands of knowledge. 

Other Aspects

• The customer is always available.

• Choose a system metaphor for the application- gives common ground for technical and business people.

       (e.g. application as production line, bill of materials, etc. )

• No overtime work.

       (Well, very little of it.)

• A stand-up meeting starts each day.

        -Many people only need to know result, so shouldn't need to wait long.