A software system for specifying design of at least two links in a
packaging chain includes first and second software modules for specifying
designs of first and second links in the packaging chain. The software
modules have respective parameters each of which should not normally be
breached. A conversion system interconnects the first software module and
the second software module to enable data representing the link in the
packaging chain specified by either the first software module or the
second software module to be recognized in the other of the software
modules. A feedback system provides feedback when there is a breach.