" We live in an age in which the volume of available information stupefies us. On any relatively interesting subject we can find thousands of Web pages, tens—if not hundreds—of books, and article after article. How do we filter all this information? How do we process all this information? Core values and principles provide one mechanism for processing and filtering information. They steer us in the direction of what is more, or less, important. They help us make product decisions and evaluate development practices. "

― , Agile Project Management: Creating Innovative Products