Another issue with the SWBS classification is that it is
system based rather than production based. The current
system ignores the possibility of production friendly
designs which would reduce costs. This is an issue that
arises when designers try to optimize one aspect or system
rather than the efficient production of the vessel as a
whole. Figure 14 shows the effect of increasing the deck
height of the DDG51 from 9ft to 11'2". Since 6'5" is
required for access of personnel, the DDG51 had only 2'7"
available for distributive systems.