Figure 8-6 Mistake-Proofing the Design of Health Care Processes - Figure 8.6. Position locks on x-ray film ensure correct positioning of the tubeReturn to Document Current as of May 2007 Internet Citation: Figure 8-6: Mistake-Proofing the Design of Health Care Processes -. May 2007. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/quality-patient-safety/patient-safety-resources/resources/mistakeproof/mistakefig8-6.html