not sure what you mean by routing, but I can share the way I due it at my shop. For each job that comes in I make a control plan with all the information needed to perform the work. I also number each dimension that I want to moniter during the run. I have a record sheet with the dimensions, tolerances, and numbers to corrispond with the control plan. All this paperwork goes out to the machine at time of production. You can make a seperate sheet with the more critical dimensions for the inspector to check if you have inspectors at your place. As far as how often? Well you need to know and trust your people how good they are, and pick a number of checks. once per shift, once every 2 hours, etc. Hope this helps. I am ISO9002/2000 compliant so I develop all types of documents to make the job and life of my people easy.