The term network-centric warfare broadly describes the combination of emerging tactics, techniques and procedures that a networked force can employ to create a decisive warfighting advantage. According to John Keegan, author of A History of Warfare, it is similar to the significant warfighting developments of the industrial age and agrarian age in that network-centric warfare seeks to exploit an order of magnitude change in an underlying source of power to increase warfighting advantage dramatically. Paula Kaufman, in an article she wrote for IEEE Spectrum, agrees with this opinion. In the industrial age, power was primarily derived from mass and the sources of power for moving mass. In the information age, power is increasingly derived from information sharing, information access and speed, she says.