Finally, several sources pointed out that any definition of advanced manufacturing will need to change with the changing times, and that the definition will vary for different companies and different industries. The White House survey states: "Most discussants agree that an appropriate advanced manufacturing definition should be dynamic in nature and be treated as more of a benchmark. That is, there is a constant iteration of improving manufacturing frontiers...Therefore, what is classified as "frontier" is constantly changing, and, likewise, advanced manufacturing is constantly changing."