Why would you take an untested schematic to a manufacturer and ask them to build a product based off of it? If you are asking the manufacturer to both devise th

Why would you take an untested schematic to a manufacturer and ask them to build a product based off of it? If you are asking the manufacturer to both devise the schematic and build the resulting product, then it behooves you to ask for a prototype built from their schematic in order to evaluate the production's performance.