Figure 2-5 Mistake-Proofing the Design of Health Care Processes - Figure 2.5. A fault tree example Note: P = probability, F = basic failure.Return to Document Current as of May 2007 Internet Citation: Figure 2-5: 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/mistakefig2-5.html