According to Highsmith and Cockburn (2001, p. 122), “what is new about agile
methods is not the practices they use, but their recognition of people as the
primary drivers of project success, coupled with an intense focus on
effectiveness and maneuverability. This yields a new combination of values and
principles that define an agile world view.” Boehm (2002) illustrates the
spectrum of different planning methods with Figure 1, in which hackers are
placed at one end and the so called inch-pebble ironbound contractual approach
at the opposite end