1.8 human interaction with the system Flashcards
what is accessability?
the potential of a service, product, device or environment to serve and meet the needs as many individuals as possible
what does high accesability mean?
the system can meet the needs of many people
what does low acessability mean?
the system presents barriers to specific groups of people
what does usability mean?
the potential of a product, application or website to accomplish user goals
what does ergonomics mean?
the design of safe and comfortable products, systems or [processes, specifically for people
another word for ergonomics
human engineering
example of ergonomics
ergonomic keyboards - shaped by ergonoimic consideration in order ot improve users’ comfort
the eight quality components of usability
- complexity/simplicity
- effectiveness
- efficiency
- error
- learnability
- memorability
- readability
- satisfaction
what does simplicity mean?
the amount of effort to find a solution or get a aresult
what does effectiveness refer to?
comaprison of user performacne against a predefined level
what does efficiency refer to?
task completion time after initial adjusting period
what does error refer to?
number of errors, type of errors and time needed to recover from the error
what does learnability refer to?
time used to accomplish tasks on the first use
what does memorability mean?
time, number of button clicks, pages and steps used by the users when they return the device after a period of not using it
what does readability refer to?
reading speed
what does satisfaction refer to?
attitude of users toward applciations after using them
useability problems with GPS/bavigation systems
- small screen
]2. low quality speakers - antenna with poor performance that makes it difficult to receive a satellite signal
- inaccurate geographical data
- outdated street data
- inefficient routing software
usability problems with tablets
- accidental touches leads to undesired slections
- difficult to learn different gesture geatures of various manufacturers
- poor scaling and zoom control
- difficult to use control features
- small side buttons
- poorly written instructions
usability problems of game consoles
- some portable game consoples have relatively small screen
- buttons may be too small
- difficult to use outdoors (not enough brightness)
- short battery life
usability problems of PCs
- excessive keyboard may lead to RSI syndrome
- excessive use of a large, bright screen may cause eyesight problems or strain the eyes
- poor room lighting conditions may lea to distracting refelcion on the screen
- the mouse of a pc is designed for right-handed people
what does RSI stand for?
repetitive strain injury
usability problems of digital cameras
- incorrect calibration of touch screen menus
- need to hold the camera vertically -> doesnt allow convenient navigation through the touch screens (i.e.. auto rotate screen option would be better)
- extra hardware component needed for inadequarte flash features
- buttons are too small
- some requires specific software for connection with computer to transfer files
usability problems of mobile phones
- kepyboard is very small
- not all users need all the special features
usability problems of mp3 devices
- tuny buttons
- insufficent memory
- fragile - lack of a screen
how can the usability of mp3 devices be improved?
- use of NLP
- making the overall interface more intuitive
- use of acceleration sensors or gesture control - enhance functionality (e.g. shaking the device to change song)
what does NLP stand for?
natural language processing
disabilities and accessibility: visual impairment (input)
braille input devices
disabilities and accessibility: visual impairment (output)
- speech output devices to read screen text
- capability to adjust colour of display for colour blindness
disabilities and accessibility: hearing and speech impairments (input)
no problem
disabilities and accessibility:hearing and speech impairments (output)
- replace sound signals with visual effects
- use of subtitles
disabilities and accessibility:cognitive problems and learning diasbilities (input & output)
- speical software that provides active participation and multi-sensory expereinces
disabilities and accessibility: mobility impairments (input)
- pointing device to press keys
- mouth and head-sticks
- left-handed and right-handed keyboards
- expanded keyboards with larger keys
- natural language processing (voice and speech recognition)
disabilities and accessibility:mobility impairments (output)
no problem
