In the manufacturing world, the later suppliers and other external parties are involved in the design process, the more expensive manufacturing becomes. Manually notifying outside parties of changes to specifications can be a costly drain on resources - not to mention an often-overlooked hassle for personnel - that may lead to excessive and expensive reworking and retesting. At worst, poor communication between manufacturers and external parties may lead to months spent developing and testing a new product only to find it cannot feasibly be manufactured in volume.
In the blood and biologics world provider organizations need to keep processors informed of changes to donor criteria or other critical processes. Ideally, processors should be able to participate directly in making changes while a process is already underway.
Outside of manufacturing, other departments such as Regulatory and Quality use outside consultants, medical writers, and other experts to help collaborate on and refine documents. These external parties also assist with project management and process refinement.