In Part 1 (see "Agile Project Leadership Circa 1899, Part 1," 30 March) we saw how Wilbur and Orville Wright demonstrated three of the six principles of the modern-day Declaration of Interdependence for agile project leadership (www.pmdoi.org) by tackling the largest uncertainty first (the control system), by approaching the problem in annual iterations culminating each year with fulfillment tests at Kitty Hawk, and by selecting