Second, you need to be satisfied that the references in the matrix do actually relate to each of the stated requirements. Including the trace matrix within the supplier's scope also encourages discussion on each of the clauses in the URS and anything that promotes communication between purchaser and supplier is a good thing.
The supply of an automation system for an API manufacturing plant can help illustrate the concepts discussed above. In this case, an existing pharmaceutical manufacturing plant was modified to produce a new product, while still retaining the capability to make the product for which it was originally designed.
Because the existing control system could not be further expanded, input/output modules for new parts of the plant, and new controllers and operator interface were added to the existing field interface equipment. Product was made for stock so as to maintain supplies during the plant shutdown.