In the design stage of the process, it may not be possible to anticipate what types of changes may develop along the way during a new product introduction. However, where there is the expectation of later changes, the prototyping process can be used to satisfy a variety of contingencies.
For example: Your part may be slated for die cast production, but the product launch team may decide to take a more measured approach to the product introduction, calling for a limited production of parts in stages. The number of parts needed immediately, and the quantity in weeks or months later has yet to be decided. One of the ways to address this uncertainty is to bring your prototype supplier into the picture. He should a able to formulate a production strategy with a variety of options. By making accommodations in the construction of the tooling your prototype supplier will be in a position to meet a variety of production requirements. You may not need to implement this plan, but it can provide immeasurable peace of mind knowing that you are prepared for a variety of outcomes.