Usability
This presentation covers:
• What Usability is and isn’t
• Some of the tools of Usability
• Some dos and don’ts of Usability
• The end goals of Usability
What Usability Testing Isn’t
Readability either, such as…
The Gunning Fog Index:
Avg. sentence length + the number of words of 3 syllables or more per 100 words * 0.4 = the approximate grade level at which material can be read.
OR…
What Usability Testing Isn’t
Flesch-Kincaid Grade Level Formula:
0.39 * (average words/sentence ) + 11.8 * (average syllables/word) - 15.59 = Grade Level.
Question: Who do you think uses such formulary…and for what purposes?
What Usability Testing Isn’t
• The Dept. of Education
• School Districts
• College Presses
• Book Publishers
…And so on and so forth!
What Usability Testing Isn’t
Readability is “Denotative,” metrics-driven
(formulaic, quantitative…)
Whereas Usability is…
“Connotative” and people-oriented
Readability “Calculates,”
Usability “Infers!”
Usability IS
Simply put…
The ease with which people can employ a particular tool or other human-made object in order to achieve a particular goal or task.
Passive vs. Active Testing
Gathering user opinions about a document (or a product) via surveys, forms, hand-outs, etc. is Passive Usability Testing.
Active testing involves a controlled experiment to determine how well people actually use the document (or product).
Usability
Rather than showing users a rough draft and asking, "Do you understand this?", usability testing involves watching people trying to use something for its intended purpose…
To complete a specific task!
UsabilityExample…
When testing instructions for assembling a toy, the test subjects should be given the instructions and a box of parts. Instruction phrasing, illustration quality, and even the toy's design all affect the assembly process.
Usability
In human-computer interaction and computer science, Usability refers
to the elegance and clarity with which the interaction with a computer program or a web site is designed.
Usability & Ascertainment
The FCC requirement for non-commercial broadcast stations applies U-techniques:
• Questionnaires, Mail-Outs
• Person-on-the-street surveys
• Telephone polling in key markets
Usability• Usability attempts to observe how effectively a user (or a consumer) interacts with a document (or product).
• 3 questions to consider when determining a document’s Usability…
Usability & Documentation• How easy is it to learn?
• How easy is it to use?
• How satisfying is the experience?
The Semantic Differential
One of the best-known and most widely used Usability tools is the Semantic Differential.
Example: Please check one of the boxes below?
Excellent Good Adequate Poor Inadequate
� � � �
The Semantic DifferentialThe Semantic Differential was developed in the 1950s by University of Illinois psychologist Charles Osgood.
The Semantic Differential is a rating scale used to measure the connotative meaning of objects, events, and concepts.
Osgood’s Semantic Differential
In Osgood's Semantic Differential, the respondent is asked to choose where their position lies on:
• A range of words or numbers spanning across a bipolar position, or
• A scale between two bipolar terms.
Usability TechniquesImitation…
• Can be the highest form of praise
OR
• The mother of re-invention.
SO…
Usability TechniquesDocument Usability means that people who use documents created by you, the writers, can do so quickly and easily to accomplish their own tasks. Technical writers thinking about the usability of their documents should…
Document Techniques• Focus on the end-users
• Understand that people use documentation to be productive
• Realize that users are busy people trying to accomplish tasks
• Remember that users decide when a document is easy to use…ultimately!
Usability Testing Usability testing involves measuring how
well users respond in 4 areas:
• Time
• Accuracy
• Recall
• Emotional Response
Usability Testing
• Time on Task -- How long does it take the user to complete a basic task?
(Example: Enter a new patient, order a test, obtain the results of the test, generate a report of test results.)
Usability Testing
• Accuracy -- How many mistakes did the user make?
(And were they fatal or recoverable with the right information?)
Usability Testing• Recall -- How much does the user
remember afterwards or after periods of non-use?
Usability Testing
• Emotional Response -- How does the person feel about the task completed?
(Confident? Stressed? Would the user recommend this system to an associate?)
Methodology: Heuristics
Some of the guidelines for applying Usability best practices are what communicators have termed Heuristics.
(pronounced: your - wrist - ticks)
Methodology: Heuristics Heuristics can…
• Lead to solutions that are reasonably close to the best possible answer,
• Provide "rules of thumb," educated guesses, intuitive judgments or simply common sense,
• Employ strategies that use readily accessible, though loosely applicable, information to control problem-solving in situations.
Methodology: Heuristics
NOW, here’s Mike’s “Top 10 List” of
How To Apply Heuristics To Your Documentation…
Mike’s “Top 10 List” of Heuristic Methodology
10. Load pages and content in a timely way.
9. Speak user’s language in terms they know.
Mike’s “Top 10 List” of Heuristic Methodology
10. Load pages and content in a timely way.
9. Speak user’s language in terms they know.
8. Be consistent with graphics, buttons, content.
Mike’s “Top 10 List” of Heuristic Methodology
10. Load pages and content in a timely way.
9. Speak user’s language in terms they know.
8. Be consistent with graphics, buttons, content.
7. Make key information visible.
Mike’s “Top 10 List” of Heuristic Methodology
10. Load pages and content in a timely way.
9. Speak user’s language in terms they know.
8. Be consistent with graphics, buttons, content.
7. Make key information visible.
6. Always keep users oriented.
Mike’s “Top 10 List” of Heuristic Methodology
5. Provide clearly marked exits.
4. Tailor actions to novice and expert users.
Mike’s “Top 10 List” of Heuristic Methodology
5. Provide clearly marked exits.
4. Tailor actions to novice and expert users.
3. Minimize “off-task,” non-essential information.
Mike’s “Top 10 List” of Heuristic Methodology
5. Provide clearly marked exits.
4. Tailor actions to novice and expert users.
3. Minimize “off-task,” non-essential information.
2. Express error messages in plain language.
Mike’s “Top 10 List” of Heuristic Methodology
5. Provide clearly marked exits.
4. Tailor actions to novice and expert users.
3. Minimize “off-task,” non-essential information.
2. Express error messages in plain language.
1. Use minimalism for wording and designs.
Verbal MinimalismSaying More with Less!• Economy: Don’t use 24 steps if 12 will do!
• Edit, chop, cut and then edit some more!
Verbal MinimalismSaying More with Less!• Economy: Don’t use 24 steps if 12 will do!
• Edit, chop, cut and then edit some more!
French writer Blaise Pascal, in a 6-page letter to a friend, once said, “I apologize for writing you 6 pages but I didn’t have time to write only 3.”
Focus Groups…• Can provide the best “litmus test” of
your documentation’s usability by providing you with direct, objective user feedback.
• Are an “Active” approach to U-testing!
Client Focus Groups
BUT if we can’t go on-site,
how do we obtain clients’
DIRECT feedback?
HOW can we obtain
clients’ input?
Client Focus Groups
SNUG
• SoftIWS / FLARE Help demo
Purpose: Show & Tell only, OR
Let clients test-drive the system:
1. Observe their usage, comments.
2. Sell themselves on Help product.
Client Focus Groups
SNUG
• SoftIWS / FLARE Help demo
• Other team activities: Active vs. Passive
(To be tabled for another meeting!)
AND don’t forget sources close to home…
Usage Data Warehousing
• External client-based usage data
• Internal staff-based usage input
Hosted on Shared Folder site in…
User Feedback:“The Good, The Bad,and The (sometimes) Smugly!”
What to expect?
• Adulation?
• Gripes?
• Useful Input!
User Feedback:“The Good, The Bad,and The (sometimes) Smugly!”
What to expect?
• Adulation?
• Gripes?
• Useful Input!