From Chapter 8 (pp. 37-42) of the White Book [ISBN:0201616416]

=== Fundamental principles ===

    * Rapid feedback
    * Assume simplicity
    * Incremental change
    * Embracing change
    * Quality work

=== Less central principles ===

    * Teach learning
    * Small initial investment
    * Play to win
    * Concrete experiments
    * Open, honest communication
    * Work with people's instincts, not against them
    * Accepted responsibility
    * Local adaptation
    * Travel light
    * Honest measurement