Analysis of U-scan machines

1
Analysis of U-scan machines

• Group 4
• Olivia Tran Jamie Tran
• Josh Wortman Calvin Hsu
• Oscar Guerrero Shawn Flynn
• Andrew Wong Todd Espiritu Santo

2
The U-Scan Express
3
The Facts Behind the Machine

• Started in the early 1990s
• Designed to save on operating costs
• Available in several national store chains
  (Ralphs, Home Depot, Wal-Mart, etc)
• Multiple models

4
Functionality

• Place items on the holder

5
Functionality

• Initiate user interface software
• Select language
• Scan Ralphs Club Card
• Scan items in

6
Functionality

• Scan in the items and place into bags

Scanning device
User Interface
7
Functionality

• Checking out and paying

Payment device
User Interface
8
Analysis User Interface

• Pros
• Gives feedback for most operations
• Monitor position
• Button labels
• Bi-Modal
• Back buttons

9
Analysis User Interface

• Cons
• Grouping of buttons
• Absence of feedback on some operations

10
Analysis User Interface

• Cons
• Grouping of buttons
• Absence of feedback on some operations

11
Analysis Scanning and Bagging

• Pros
• Beep indications
• Walk through steps
• Visual Feedback

12
Analysis Scanning and Bagging

• Cons
• Poor bag anchors
• No indication of where to place extra bags
• Weighing foods and your hand

13
Analysis Scanning and Bagging

• Cons
• Poor bag anchors
• No indication of where to place extra bags
• Weighing foods and your hand

14
Analysis Payment and Checkout

• Pros
• Coupons
• Variety of Payment methods
• Combine Payment methods

15
Analysis Payment and Checkout

• Cons
• Where is the Receipt?
• Double prompt
• Cant use bills over 20

16
Breaking the Machine

• Subject New user Todd
• Fairly easy, no errors encountered
• Subject Veteran user Oscar
• Handles complex errors well

17
Usability Analysis

• Questionnaire
• Reasons to use
• Ease of use
• Taken during weekends at busy times
• 45 samples

18
Usability Analysis

• User Statistics

Experienced Novice
N 37 8
Mean Age 29 30
Mean Items Purchased 6.4 4.7
19
Usability Analysis

• Method of Payment

Experienced
Novice
20
Usability Analysis

• Ease of Use

Experienced
Novice
21
Usability Analysis

• User Experience

Novice
Experienced
Used to save time 92 63
Used to save time, feel they saved time 91 50
Did not use to save time but feel they saved anyways 67 33

22
Usability Analysis

• User Experience

Experienced
Novice
Instructions Instructions
Clear 97 97 43
Not Clear 0 0 29
Did Not Listen 3 3 29
Opinion of Computer Voice Opinion of Computer Voice Opinion of Computer Voice
Pleasant 36 36 14
Annoying 22 22 29
No Opinion 42 42 57
23
Usability Analysis

• User Experience Overall Opinion

Using the following rating scale, please circle
your rating for the following questions 1
Confusing Problematic 2 Some problem or
difficulty 3 Easy, no problem
Rated Experience of
Checking the items 2.73 2.38
Interacting with the touch screen 2.95 2.38
Completing payment 2.84 2.25
Experienced
Novice
24
Does the USCAN employ a user centered design??
DESIGN MODEL
USERS MODEL
DESIGNER
USER
SYSTEM
SYSTEM IMAGE
P.O.E.T., p. 190
25
Does the USCAN hold to Normans seven principles??

• Seven Principles for Transforming Difficult Tasks
  into Simple Ones
• Use knowledge in the world and knowledge in the
  head.
• Simplify the structure of tasks
• Make things visible
• Get the mappings right
• Exploit the power of constraints
• Design for error
• When all else fails, standardize

26
U-Scan vs. Cashier

• U-Scan
• Privacy
• Feel in control
• Go at your own pace
• Item list with prices
• Saves time
• Cost effective

• Cashier
• Comfort
• Bagging handled for you (no squished bread)
• Price checks
• Quick error fixes

27
Recommendations

• User interface
• Group buttons by function

28
Recommendations

• User interface
• Add an animation for processing

29
Recommendations

• Scanning and Bagging
• Anchor the bag holder
• Large sign to show where to put overflow bags

30
Recommendations

• Payment
• Receipt should be moved closer to the monitor
• Get rid of the double prompt

31
Conclusion

• Overall rating 9/10
• Special thanks to manager man
• Josh had a traumatic employee incident

32
(No Transcript)