SlideShare a Scribd company logo
@justuxdesign | justuxdesign.com 1
The art of error proofing with
Poka-yokeBy Chris Myhill
@justuxdesign | justuxdesign.com 2
I’ve worked a lot of work with…
I’m the founder of…
Who’s this chucklehead, then?
@justuxdesign | justuxdesign.com 3
Poka-yoke
@justuxdesign | justuxdesign.com 4
Poka-yoke
Poka = ‘Error’
Yoke = ‘Proof’
@justuxdesign | justuxdesign.com 5
Baka-yoke
Poka = ‘Error’
Yoke = ‘Proof’
Baka = ‘Idiot’
@justuxdesign | justuxdesign.com 6
Poka-yoke
Poka = ‘Error’
Yoke = ‘Proof’
Baka = ‘Idiot’
@justuxdesign | justuxdesign.com 7
Shigeo Shingo
“There are four purposes of
improvement : Easier, faster, better
and cheaper… In that order”
Creator of poke-yoke
@justuxdesign | justuxdesign.com 8
@justuxdesign | justuxdesign.com 9
Switch buKon
Switch casing
Spring
@justuxdesign | justuxdesign.com 10
Completed switch!
@justuxdesign | justuxdesign.com 11
Switch buKon
Switch casing
Spring
@justuxdesign | justuxdesign.com 12
@justuxdesign | justuxdesign.com 13
Blame the user!
The original solution…
@justuxdesign | justuxdesign.com 14
Poka-yoke, away!
@justuxdesign | justuxdesign.com 15
Switch buKon
Placeholder
Spring
@justuxdesign | justuxdesign.com 16
Switch buKon
Placeholder
@justuxdesign | justuxdesign.com 17
Completed switch!
@justuxdesign | justuxdesign.com 18
@justuxdesign | justuxdesign.com 19
User error is a
symptom of
bad design
Lightbulb moment…
@justuxdesign | justuxdesign.com 20
Poka-yoke takes on the
World
@justuxdesign | justuxdesign.com 21
Poka-yoke takes on the
Flat
@justuxdesign | justuxdesign.com 22
@justuxdesign | justuxdesign.com 23
@justuxdesign | justuxdesign.com 24
@justuxdesign | justuxdesign.com 25
@justuxdesign | justuxdesign.com 26
@justuxdesign | justuxdesign.com 27
@justuxdesign | justuxdesign.com 28
@justuxdesign | justuxdesign.com 29
@justuxdesign | justuxdesign.com 30
@justuxdesign | justuxdesign.com 31
@justuxdesign | justuxdesign.com 32
@justuxdesign | justuxdesign.com 33
@justuxdesign | justuxdesign.com 34
How important is all of this, really?
@justuxdesign | justuxdesign.com 35
Doors
Let’s talk about
@justuxdesign | justuxdesign.com 36
@justuxdesign | justuxdesign.com 37
Affordances
Using characteristics that
suggest interactivity
Push Pull
@justuxdesign | justuxdesign.com 38
“When a device as simple
as a door needs to come
with an instruction
manual, then it is poorly
designed.”
@justuxdesign | justuxdesign.com 39
“When a device as simple as a door
needs to come with an instruction
manual, then it is poorly designed.”
- Don Norman, the design of every things
@justuxdesign | justuxdesign.com 40
@justuxdesign | justuxdesign.com 41
Let’s get
Digital
@justuxdesign | justuxdesign.com 42
Add to basket
Example #1
@justuxdesign | justuxdesign.com 43
Add to basket
Example #1
Error-prone example
@justuxdesign | justuxdesign.com 44
Add to basket
Example #1
Error-prone example
@justuxdesign | justuxdesign.com 45
Add to basket
Example #1
Poka-yoke’d example
@justuxdesign | justuxdesign.com 46
Add to basket
Example #1
Poka-yoke’d example
@justuxdesign | justuxdesign.com 47
Add to basket
Example #1
Poka-yoke’d example
@justuxdesign | justuxdesign.com 48
RegistraUon Forms
Example #2
06 august 89
@justuxdesign | justuxdesign.com 49
RegistraUon
forms
Example #2
Error-prone example
@justuxdesign | justuxdesign.com 50
RegistraUon
forms
Example #2
Error-prone example
@justuxdesign | justuxdesign.com 51
RegistraUon
forms
Example #2
Error-prone example
@justuxdesign | justuxdesign.com 52
Poka-yoke’d example
RegistraUon
forms
Example #2
Using clearer input fields
@justuxdesign | justuxdesign.com 53
Poka-yoke’d example
RegistraUon
forms
Example #2
Using clearer input fields
@justuxdesign | justuxdesign.com 54
Poka-yoke’d example
RegistraUon
forms
Example #2
Using clearer input fields
AUG
@justuxdesign | justuxdesign.com 55
Poka-yoke’d example
RegistraUon
forms
Example #2
Using the ‘field reflecUon’ paKern.
@justuxdesign | justuxdesign.com 56
‘Advanced Search’
Example #3
‘Faceted NavigaUon’
vs
@justuxdesign | justuxdesign.com 57
Advanced search
Example #3
Error-prone example
Faceted NavigaUon
vs.
@justuxdesign | justuxdesign.com 58
Advanced search
Example #3
Error-prone example
Faceted NavigaUon
vs.
@justuxdesign | justuxdesign.com 59
Advanced search
Example #3
Error-prone example
Faceted NavigaUon
vs.
@justuxdesign | justuxdesign.com 60
Advanced search
Example #3
Faceted NavigaUon
vs.
Poka-yoke’d example
@justuxdesign | justuxdesign.com 61
Advanced search
Example #3
Faceted NavigaUon
vs.
Poka-yoke’d example
@justuxdesign | justuxdesign.com 62
0 results found
Example #4
@justuxdesign | justuxdesign.com 63
0 results found
Example #4
Error-prone example
@justuxdesign | justuxdesign.com 64
0 results found
Example #4
Poka-yoke’d example
AutomaUcally correct the spelling
@justuxdesign | justuxdesign.com 65
0 results found
Example #4
Poka-yoke’d example
Provide useful alternaUves
@justuxdesign | justuxdesign.com 66
0 results found
Example #4
Poka-yoke’d example
Turn ‘error’ into an opportunity
@justuxdesign | justuxdesign.com 67
A note on styling
@justuxdesign | justuxdesign.com 68
Affordances
Using characteristics that suggest interactivity
@justuxdesign | justuxdesign.com 69
• AcUon #1
• AcUon #2
• AcUon #3
Here are some links.
Touch ‘em with your pudgy
human fingers. Go on, I dare
you!
AcUon #1
AcUon #2
AcUon #3
Here are some links.
Touch ‘em with your pudgy
human fingers. Go on, I dare
you!
FiK’s Law
Designing for pudgy human fingers
@justuxdesign | justuxdesign.com 70
Poka-yoke
@justuxdesign | justuxdesign.com 71
Your homework assignment…
The next Ume you’re designing an 'error screen’…
Think about how the interacUon could be revisited to
stop that error from happening in the first place.
@justuxdesign | justuxdesign.com 72
Thank you!
justuxdesign.com listmaker.io

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