Figure 8-21 Mistake-Proofing the Design of Health Care Processes - Figure 8.21. This proxy ballot will not fit into the envelope until the mailing instructions are torn offSource: Example courtesy of Linda Bontrager and the Nebraska State delegation to the Veterans Health Administration (VA)/Agency for Healthcare Research and Quality (AHRQ) Patient Safety Improvement Corps, 2005. Used with permission.Return to Document Current as of May 2007 Internet Citation: Figure 8-21: 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/mistakefig8-21.html