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Usability in HCI (Human Computer Interaction) (General Usability…
Usability in HCI (Human Computer Interaction)
What?
Degree to which system easy to use or
user friendly
Goal: improve interactions between users and computer systems
User experience goals: satisfying, rewarding, motivating, aesthetically pleasing..
General Usability Principles
Error Management
Simplicity
Aesthetics and minimalist design
no irrelevant/rarely needed info in dialogue
extra info or smth to slow them down
Help
Match to world
speak user language
use real world conventions
a tecnique called mapping
r/s controls and their movements
Recognition
make objects, actions, options visible
basic screen design
Dialog style
(characteristics MUST match user and task being performed
(design for old vs young)
fill in forms
question-answer
menus
command language
function keys
Direct manipulation
Flexibility
Provide
Accelerators
Shortcuts
i.e. ctrl C, ctrl v
bookmarks
error prevention
Navigation
allow users to easily escape/ navigate to or from places they unexpectedly find themselves
Consistency
Visbiility of system
keep user informed of what is gng on
apprropriate timely feedback
A participatory UCD
(Novice/first time users)
ease of learning/low reliance on memory
vocab restricted
task easy to carry out
error msg constructive & specific
rely on GUI interfaces (icons, pull-down menus)
Design Criteria
for Usable Software
(See, Learn, Memorise)
E
rrors
(Accuracy)
most impt for life critical/hazardous equipment
LOW error rate, easily recover from errors
capability of recovery from errors (i.e. confirmation, undo, recycle bin)
freedom from error, precision
(i.e. nuclear power ctrl panel)
E
fficiency
once learn system, high level of productivity achieved
accomplish job with min. time + effort
ratio of output to the input: efficiency = useful energy out/total energy in
production of desired effect, min. waste of time/effort/skill
i.e. DBS new user interface
1,
S
atisfaction
Pleasant to use
confident acceptance of smth, satisfactory, dependable
user friendly
Dropbox account sign in page without "forget password" vs account sign in page with "forget password" option
L
earnability
Novice User
degree to which user interface learnt quickly and effectively
Learning time
: easy to learn, designed to be easy, based on core human principles, familiar to user
i.e. Airport check in system
M
emorability
Novice User
easily remembered. user able to return to it after hiatus without having to learn it over again
i.e. poll everywhere
A participatory UCD
(Expert users)
interfacee proviide info,input mechanics map on task
Complex task = long time
direct entry of commands (efficiency)