The term "advanced manufacturing" encompasses many of the developments in the manufacturing field during the late 20th and early 21st centuries, including high tech products and processes and Clean, green, and flexible manufacturing, among others. No one definition captures everything said about advanced manufacturing, although the majority of definitions found on the web include the use of innovative technology to improve products and/or processes, and may also include the use of new business/management methodologies. Accordingly, the definition that probably comes closest to being comprehensive is that given by Paul Fowler of the National Council for Advanced Manufacturing (NACFAM), celebrating its 20th anniversary this year: