Figure 5-20 Mistake-Proofing the Design of Health Care Processes - Figure 5.20. If the plunger in this syringe pulls out easily, the tube has been properly inserted Return to Document Current as of May 2007 Internet Citation: Figure 5-20: 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/mistakefig5-20.html