Designing a Card Swipe MachinePaul Ritchey

Tanaya Nalavade

Why the card swipe machine?◦ Frequently used◦ Current designs have room for improvement

Background

Administered online questionnaire◦ n = 47

Often use card swipe machine Often or Always use debit/credit cards Card preferred over cash English generally first language Around 50% have corrected vision No one was color blind

Understanding the User

Collected user comments on existing machines

Task Analysis / Contextual Observations

Issues Possible SolutionMixed user input method Only use one method for inputCard swipe diagrams unclear Create a clear diagramUnlabeled / Unclear function of buttons

Label buttons

Button Mapping with displayed options

Buttons are encircled with the option on the display

When to use which button Use color and illuminate buttons that can be used.

Ease of Use◦ No more than 1 error per task for a novice user◦ Task times less than 30 seconds

All buttons shall be physical Design shall utilize color

◦ Enter = Green◦ Cancel = Red◦ Clear = Yellow

Buttons shall illuminate when usable Screen displayed options shall be graphically connected to their

corresponding physical buttons Buttons should be labeled

Usability Goals & Requirements

3

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1 ENTER

CLEAR

CANCEL

SWIPE CARD TO START[DIAGRAM ABOUT SWIPING THE CARD]

Prototype Version 1

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CHOOSE PAYMENT TYPE

ENTER

CLEAR

CANCEL

Debit

Credit

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CLEAR

CANCEL

ENTER PIN

**

Users told to complete a debit transaction use the prototype◦ Record task time◦ Errors◦ And any comments

19 users tested

Testing the Design

Debit Transaction◦ Avg Time: 24.7 seconds◦ Only Pin Errors

User Comments◦ “no zero key”◦ Easy to use◦ Over all well accepted◦ Not all the buttons lit up

Results

18 19 20 21 22 23 24 25 26 27 28 29 30 31 320

1

2

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4

Prototype v1Task Time for Debit Trans-

action

Task Time in SecondsN

umbe

r of

Par

tici

pant

s

Creation of prototype Version 2◦ Added swipe example diagram◦ Button illumination extended to Enter, Cancel,

and Clear◦ Added a zero key◦ Fixed task order problem

Prototype Version 2

Revisiting the Design

User testing protocol changes◦ Asked to perform both tasks◦ Exploring the prototype◦ Semi-Structured interview

Small sample size (n = 5) Over all positive response No card swipe errors Task Times (avg)

◦ Debit = 15◦ Credit = 12.6

V2 User Testing Results

Validation of design changes◦ Progress bar◦ Illumination of buttons

User Comments and Issues◦ Zero did not illuminate◦ “Shouldn’t use ‘!’”◦ “Swipe diagram is good”◦ Should standardize text◦ “Card Diagram might be too unrealistic”

V2 User Testing Results

Language support Card Diagram

◦ Use real image Font standardization Zero illuminates

Prototype V3

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SWIPE CARD TO START

en Español

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CHOOSE PAYMENT TYPE Debit

Credit

0

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CLEAR

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ENTER YOUR PIN

0

User Profile Task Analysis Usability Requirements Create First Prototype User Testing Create Second Prototype User Testing Create Third Prototype

Summary of Project

Questions?!

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PRESS ENTER TO PROCEED

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IS THIS AMOUNT CORRECT ? $15.46

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Yes

No

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PROCESSING

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PROCESSING

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PROCESSING

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ACCEPTED

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TRANSACTION COMPLETEDTHANK YOU !

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SWIPE CARD TO START

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CHOOSE PAYMENT TYPE

ENTER

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ENTER PIN

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ENTER PIN

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ENTER PIN

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PRESS ENTER TO PROCEED

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JOH

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IS THIS AMOUNT CORRECT ? $15.46

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1 ENTER

CLEAR

CANCEL

Yes

No

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PROCESSING

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PROCESSING

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INCORRECT PIN NUMBER

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SWIPE CARD TO START

JOH

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CHOOSE PAYMENT TYPE

ENTER

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Debit

Credit

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TRANSACTION CANCELED!

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SWIPE CARD TO START

JOH

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B DO

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CHOOSE PAYMENT TYPE

ENTER

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CANCEL

Debit

Credit

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JOH

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B DO

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1 ENTER

CLEAR

CANCEL

TRANSACTION COMPLETEDTHANK YOU !

0

JOH

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1 ENTER

CLEAR

CANCEL

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SWIPE CARD TO START

JOH

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B DO

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1654 6874 9687 9846

3

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87

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1

CHOOSE PAYMENT TYPE

ENTER

CLEAR

CANCEL

Debit

Credit

0