Figure 6-19-20 Mistake-Proofing the Design of Health Care Processes - Figure 6.19. This defibrillator requires two-handed operation Return to DocumentFigure 6.20. Punch press made for two-handed operation, but in some locales six-handed operation will be seen as more efficient Return to Document Current as of May 2007 Internet Citation: Figure 6-19-20: 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/mistakefig6-19-20.html