Figure 6-58 Mistake-Proofing the Design of Health Care Processes - Figure 6.58. Photograph of step stool. The user's weight on this step stool prevents it from rolling Return to Document Current as of May 2007 Internet Citation: Figure 6-58: 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/mistakefig6-58.html