Evolution of the Agile Manifesto

Team vision and discipline 
over individuals and interactions (or processes and tools)

Validated learning 
over working software (or comprehensive documentation)

Customer discovery 
over customer collaboration (or contract negotiation)

Initiating change 
over responding to change (or following a plan)

 

Source: http://www.startuplessonslearned.com/2010/05/thank-you.html