Specifications should be broader during the beginning of design control, but should narrow down during the later stages. The project team can also refer to previous similar projects and compare previous specs to their estimated ones. Products sensitive to failure and/or will require in vivo testing should have smaller spec widths. It should also depend on how many sources/vendors are needed. If the product is a critical component, then more than one vendor is required. When choosing the alternate vendor, the specs of the product should be similar to the original vendor. As the amount of vendors increase, the spec width will increase to accommodate the different ranges each vendor poses. This will decrease the risk of falling out of spec, but it will also increase cost and time. Therefor, it should also depend on company’s capability of delaying the project and increasing the budget.