The document summarizes the results of a heuristic evaluation of the Line application. It describes how the application addresses the 10 usability heuristics proposed by Jakob Nielsen. For each heuristic, it provides examples from the Line interface of how the application meets or could improve upon the heuristic. It also describes one privacy concern raised during an interview with a Line user regarding other users being able to view comments on their timeline posts.

1. Heuristic Evaluation
Application Line
By 10020104

2. Heuristic Evaluation
•The 10 most general principles for
interaction design
•They are called "heuristics" because
they are more in the nature of rules of
thumb than specific usability guidelines

3. Application Line – Heuristic Evaluation

4. 1. Visibility of system status
• When “Timeline” is loading, there is a circle which
shows that it is loading new posts
• When there is a new post, it shows a message “New
posts”
• If there is no connection with network, it shows a
message “Not connected to network” (I am using Line
in order to check my network connection)
• When there is a message, it gives a report signal. If
a user turns off the sound, it only shows the
number of messages received
• Shows time of posts
• When someone “likes”/ “great”s/ “funny”s / …. and
mentions a user in comment notification comes

5. 2. Match between system and the real world
• “Not connected to network” is simple and
understandable enough. Better than phrase
“Error …..”
• “New posts” is also understandable
• When “liking” something, the usage of icons
is useful. The meanings and icons match
each other
• “Save Success!” message is understandable

6. 3. User control and freedom
•There is isn’t exactly undo/redo
functions. Line allows a user to edit,
delete posts and “likes” of his/her
friends. However, it is not so fast for
novice since these options are inside
“Settings”
•The application interface varies according
to devices too. therefore, if a user
switches from one device to another, it

7. 4. Consistency and standards
The app follows the standards.
The icons of related fields like
“Friends”, “Chats”, “More” is
consistent

8. 5. Error prevention
When searching a name, all
names with same letters
appear. It may be useful for
users who forget new friends’
names

9. 6. Recognition rather than recall
A user should not have to
remember date and time of
posts; it automatically shows

10. 7. Flexibility and efficiency of use
The basic actions are easy to do for
novice too. For example: messaging,
posting, adding friends, etc.
There is isn’t exactly undo/redo
functions. Line allows a user to edit,
delete posts and “likes” of his/her
friends. However, it is not so fast for
novice since these options are inside

11. 8. Aesthetic and minimalist design
Everything, including messages,
is related to its function

12. 9. Help users recognize, diagnose, and
recover from errors
All error messages are
understandable and use plain
text

13. 10. Help and documentation
Network connection error is
pretty understandable
(mentioned above)
New post message is pretty
understandable (mentioned
above)

14. Interview Result
Privacy

15. Timeline Post Comments
One complain came from one user of
Line whom I interviewed. She says
that in timeline, the comments to a
post are seen by everyone/friends of
a user. This means friend/s of a user
do not know each other but can read
comments of each other. She doesn’t
want others to read her comments.

16. Scenario
User A has friends B, C, D
Friend B is friend with Friend
D.
Friend C is not friend with
Friend B, Friend D.
User A posts one photo.
All friends comment.
Friend B does not want Friend
C to see his/her posts
because he/she does not know
User A
Friend B Friend C Friend D

17. Thank you!