Figure 5-12 Mistake-Proofing the Design of Health Care Processes - Figure 5.12. A regulator attached to the wall with steel cable Return to Document Current as of May 2007 Internet Citation: Figure 5-12: 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/mistakefig5-12.html