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POKA YOKE
     The Science of Mistake Proofing




Gurpreet Luthra & Dhaval Doshi
(ThoughtWorks xConf – Bangalore – July 2012)
What is POKA YOKE ?
What is POKA YOKE ?




    Poka                YOKE

Inadvertent Mistake     Prevent
What is POKA YOKE ?



The essential idea of Poke Yoke is to mistake proof the
manufacturing process --- so that mistakes cannot be
made or can be caught/fixed quickly.
Types
of Poka Yoke devices



                       Control




                       Warning
Pin Index Safety System (PISS)
Buckle Up!
Poka Yoke / Mistake Proofing
             In Software
UI Mistake Proofing
UI Mistake Proofing
UI Mistake Proofing
Radiators
Unit Tests




             IDEs
Compilers



            Pre-commit
                   •   Commit Message
                   •   Developer Names
                   •   New Files missed
                   •   Build is RED check
                   •   Run Unit Tests
Auto Save          •   Check-in to VCS
Architectural Controls



HttpSession



     No updates
     on GET

                    Context specific
                    injection
Architectural Controls



Run Under
Least Privilege
                              Primitives
                              Vs Types



            Circuit
            Breaker
Some more examples…


Password
Log Check          Live Data
                   Testing




               Keyboard
               Shortcuts
What do you think?
Pragmatic
Mistake Proofing




                   Feedback



                          Blast
                          Radius
Distributed “Agile” !!


Remote Teams

                   Long Running
                   Projects


Legacy & Complex
Codebase
                    Team Attrition
Qualities of a Good Poka Yoke



            Early

          Precise

          Painless

           Simple
Instead of a BOLD font email,
       Choose a POKA YOKE

                     Thank You

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Poka yoke: The Science of Mistake Proofing in Software

Editor's Notes

  1. Introduce
  2. Process is designed in a manner that you cannot make mistakes – CONTROL..WARNING: Will immediately catch the mistake and give you a warning.
  3. PART OF THE PROCESS. While pushing, automatically with the weight of the person – it would move forward.
  4. Control poke wasn’t a good idea here!
  5. 2 MINUTESPassword entered: Passw0rd
  6. 2 MINUTESPassword entered: Passw0rd
  7. 2 MINUTESPassword entered: Passw0rd
  8. 1 MINUTE
  9. 2 MINUTE
  10. 3 MINUTES
  11. 4 MINUTESnstead of passing Primitives around, pass “Types” like money, so that you can control what operations can be performed on the data. If you couple it with immutability, then you can be sure that intermediate layers don’t inadvertently modify the object.
  12. 4 MINUTES
  13. Instead of passing Primitives around, pass “Types” like money, so that you can control what operations can be performed on the data. If you couple it with immutability, then you can be sure that intermediate layers don’t inadvertently modify the object.3 MINUTES