Lists types of defects on the x-axis and the frequency of occurrence (number of defective cases) on the y-axis. This is obviously borrowed from high-volume production as most projects would not have such high incidences of any defect. Milosevic [17], however, uses the X-axis of the Pareto diagram to describe different types of quality problems while Kloppenborg and Petrick [18] use the X-axis of the Pareto diagram to describe “data collected”. Unlike the PMBOK standard [23], these authors therefore expand the use of the diagram from analysis of defects (that is typical of operations management environments) to be more useful on most types of project.