"... we have come to value:

    "Individuals and interactions over processes and tools"

• Tools should adapt to allow individuals to produce better work

    "Working software over comprehensive documentation"

• Less a knock on documentation
• More a goal of clearly named and written software components

    "Customer collaboration over contract negotiation"

    "Responding to change over following a plan"

• Plan should adapt or change to fit current needs
• Process should be adaptive

Iterative development seems to be common basis for virtually all models