RIES voting key interface

RIES voting key interface Jelke Bloem, Martin Majlis

Contents
Current situation
Usability problems
The user
Solutions
Interface
Code representation
Input methods
Evaluation

Current situation: Interface
Random alphanumeric code

Short explanation

Prompt to enter code

Labeled text input fields

Example image

"Verder" button to confirm and check input

Current situation: Heuristic evaluation
General heuristics (Nielsen)
The system should always keep users informed about what is going on, through appropriate feedback within reasonable time
Forms and data entry heuristics
When a task involves source documents (such as a paper form), the interface is compatible with the characteristics of the source document.
Forms are validated before the form is submitted
http://www.userfocus.co.uk/resources/formschecklist.html

Usability problems
Entering random alphanumeric characters

Input fields similar, close together

Transparency

Feedback only at the end of data entry

No error correction

Confusing example image

Usability problems: A longer key
Bigger chance of mistakes

Finding and correcting mistakes is more difficult

Takes longer to enter
More attention

Easier to lose track of position

The user
The user has:
Keyboard
Mouse
Camera

The user is good at:
Image recognition
Colours
Processing known information

Interface change ideas: sketch

Interface change ideas: chaining

Code representation
Higher base decrease code length
8 bytes = 16 characters in hexadecimal
8 bytes = 32 characters in decimal
8 bytes = 13 characters with base 32 (RIES)
8 bytes = 10 characters with base 128
logarithmic dependency

Input methods
Keyboard
lower case + upper case + numbers = 64
Mouse
Single click = 1bit
Trick: Selecting from multiple objects
Gestures
( http://detexify.kirelabs.org )
Strokes
4x4 Matrix: 16, 32 or even 64 values
Camera
Bar codes ( Wiki )

Real World Entities
User can easily recognize real world entities
Clocks - 144 values
Calendar - 366 values
Colors - 16 values
It's easy to remember short real word then code
PRO: Easy to remember
CON: Much more longer

On-line Demo
http://jdem.cz/cxsd8

Single Result
8 bytes long key
3 attempts for every method
Keyboard is better than mouse
Time recognition is hard

Evaluation
User testing

Comparing performance of different interfaces

Questionnaire about the system

Usability problems with new ideas

Usability problems with longer input

Questions?

RIES voting key interface

by Martin Majlis on Feb 04, 2010

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RIES voting key interface — Presentation Transcript