A practical guide to measuring usability: 72 answers to the most common questions about quantifying the usability of websites and software
Saved in:
| Main Author: | |
|---|---|
| Format: | Book |
| Language: | English |
| Published: |
Denver, Colo.
Measuring Usability LLC
2010
|
| Online Access: | Inhaltsverzeichnis |
| Physical Description: | 124 S. Ill., graph. Darst. |
| ISBN: | 9781453806562 1453806563 |
Staff View
MARC
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| 245 | 1 | 0 | |a A practical guide to measuring usability |b 72 answers to the most common questions about quantifying the usability of websites and software |
| 264 | 1 | |a Denver, Colo. |b Measuring Usability LLC |c 2010 | |
| 300 | |a 124 S. |b Ill., graph. Darst. | ||
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Record in the Search Index
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| adam_text | A Practical Guide to Measuring Usability
Table of Contents
Acknowledgements
..............................................................................................................
Testing
.................................................................................................................................
1.
Can you measure usability?
.............................................................................
°
2.
What is the difference between a formative and summative usability test?
.....9
3.
What is a quantitative usability
tesť?
..............................................................
Ю
4.
What are the advantages of a Quantitative Usability Test?
............................12
5.
What are the basic steps for conducting a quantitative test?
......................... 14
6.
How long does it take to conduct a quantitative usability test?
......................15
7.
How long should the test session last?
......................................................... 1
8.
How do I select the users for testing?
............................................................. 1°
9.
What are common usability
metnes9
.........................................................■■■■
lö
10.
How do I record the measurements9
............................................................
¿U
11.
Do you sit in the room with the user or behind a one-way mirror?
................21
12.
Do you compensate users for their time?
......................................................■
ĹĹ
13.
Do
1
need to conduct a pilot test?
...................................................................23
14.
Do you ask
иѕетѕ
to think aloud or have them complete the tasks silently?
. 23
15.
Is there a difference in data from unattended versus lab-based tests?
........... 25
16.
Is user testing the only way to measure usability9
.......................................
JU
Tasks
.................................................................................................................................
33
17.
How do you define the task-scenarios?
..........................................................
^
18.
What are some examples of good task-scenarios?
........................................36
19.
How do I select the tasks for testing?
.............................................................37
20.
If users select their own tasks, can I still measure usability?
.........................38
21.
How long should a task scenario last?
............................................................39
22.
Howmany tasks should I have the users attempt?
.........................................40
23.
Should all the use« get the tasks in the same or different order?
................. 40
24.
How do I counterbalance the order of the tasks to avoid a learning effect?...
42
25.
Should users repeM tasks or only attempt them once?
....................................44
Sample Size
..............................................................................................................................
46
26.
Do I only need to test with
5
users?
..................................................................47
27.
What is the minimum sample size I should plan for?
......................................50
28.
How do I determine my sample size?
............................................................52
Metrics
....................................................................................................................................56
29.
How do you measure
Ш
problems?
...............................................................57
30.
If
1
user encounters a problem will it impact
1 %
or
20%
of all users?
......... 58
31.
How do you determine task success or failure?
............................................60
32.
How do you code task completion rates?
.......................................................60
33.
When do you start and stop the time?
............................................................61
34.
What is an acceptable task completion rate?
..................................................62
35.
What is an error?
.............................................................................................64
36.
Do I need to record errors?
.............................................................................64
A Practical Guide to Measuring Usability
37.
How do you record errors?
.............................................................................65
38.
How do you analyze errors?
...........................................................................65
39.
What is an acceptable average number of errors per task?
.............................66
40.
Do I need to convert errors into an error rate?
...............................................68
41.
How do you define an error opportunity?
......................................................69
42.
What is an acceptable minimal error rate per task?
........................................70
43.
How long should a task take?
.........................................................................72
44.
Is there a single usability score that I can report9
...........................................73
45.
What is SUM?
................................................................................................74
46.
How do you measure leamabibty?
.................................................................75
47.
Should you assist users during a usability test?
..............................................77
48.
If you assist a user during a task, is it a task failure 5
.....................................78
Questionnaires
...................................................................................................................80
49.
Do I administer a questionnaire after each task or
aí
the end of the test9
......81
50.
What post-test satisfaction questionnaires do you recommend?
....................82
51.
What is an acceptable
SUS
Score7
.................................................................84
52.
What post-task satisfaction questionnaires do you recommend7
...................86
53.
Can
1
ose
my own questionnaire or should I use a standardized one?
...........89
54.
How many scale points should a response item have;
3, 5, 7
or more?
.........90
55
Does it matter if the number of scale steps is odd or even9
...........................91
56.
Should I alternate positive and negative statements in my questionnaire9
.... 92
57.
Can I use statistical tests to analyze questionnaire data9
................................94
Analysis
.............................................................................................................................96
58.
Why
&
how do
1
compute a confidence interval around a completion rate?
. 97
59.
How do I compute a confidence interval around an average task time?
........99
60.
How do I compute a confidence interval around a mean satisfaction score?
102
61.
How do I compute a confidence interval around a UI Problem?
.................103
62.
Should I put the confidence intervals
mareport?
........................................104
63.
What confidence level do I use?
...................................................................105
64.
Do my data need to be normally distributed?
...............................................107
65.
What percent of all users can complete a task based on my sample?
..........109
66.
Will
aí
least 70V» (or another percent) of all users complete a task?
............110
67.
Will the average user task time be less than
2
minutes (or another time)?
..112
Reporting
.........................................................................................................................
Π
4
68.
What should go into the report?
...................................................................115
69.
Should
1
use the Common Industry Format for reporting results?
...............116
70.
Do you include failed task times in the reported average task time?
...........117
71.
How should I report average task time?
.......................................................117
72.
Can
Ϊ
report percentages on completion rates from a small sample9
...........119
References
............................................-..........................................................................121
About the Author
............................................................................................................ 124
|
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| illustrated | Illustrated |
| indexdate | 2024-07-10T00:59:48Z |
| institution | BVB |
| isbn | 9781453806562 1453806563 |
| language | English |
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| physical | 124 S. Ill., graph. Darst. |
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| publisher | Measuring Usability LLC |
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| spelling | Sauro, Jeff Verfasser (DE-588)1022650173 aut A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software Denver, Colo. Measuring Usability LLC 2010 124 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Digitalisierung UB Regensburg - ADAM Catalogue Enrichment application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027013469&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Sauro, Jeff A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title | A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title_auth | A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title_exact_search | A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title_full | A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title_fullStr | A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title_full_unstemmed | A practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title_short | A practical guide to measuring usability |
| title_sort | a practical guide to measuring usability 72 answers to the most common questions about quantifying the usability of websites and software |
| title_sub | 72 answers to the most common questions about quantifying the usability of websites and software |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027013469&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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