1.8 human interaction with the system

Question 1

what is accessability?

Answer 1

the potential of a service, product, device or environment to serve and meet the needs as many individuals as possible

Question 2

what does high accesability mean?

Answer 2

the system can meet the needs of many people

Question 3

what does low acessability mean?

Answer 3

the system presents barriers to specific groups of people

Question 4

what does usability mean?

Answer 4

the potential of a product, application or website to accomplish user goals

Question 5

what does ergonomics mean?

Answer 5

the design of safe and comfortable products, systems or [processes, specifically for people

Question 6

another word for ergonomics

Answer 6

human engineering

Question 7

example of ergonomics

Answer 7

ergonomic keyboards - shaped by ergonoimic consideration in order ot improve users’ comfort

Question 8

the eight quality components of usability

Answer 8

1. complexity/simplicity
2. effectiveness
3. efficiency
4. error
5. learnability
6. memorability
7. readability
8. satisfaction

Question 9

what does simplicity mean?

Answer 9

the amount of effort to find a solution or get a aresult

Question 10

what does effectiveness refer to?

Answer 10

comaprison of user performacne against a predefined level

Question 11

what does efficiency refer to?

Answer 11

task completion time after initial adjusting period

Question 12

what does error refer to?

Answer 12

number of errors, type of errors and time needed to recover from the error

Question 13

what does learnability refer to?

Answer 13

time used to accomplish tasks on the first use

Question 14

what does memorability mean?

Answer 14

time, number of button clicks, pages and steps used by the users when they return the device after a period of not using it

Question 15

what does readability refer to?

Answer 15

reading speed

Question 16

what does satisfaction refer to?

Answer 16

attitude of users toward applciations after using them

Question 17

useability problems with GPS/bavigation systems

Answer 17

1. small screen
   ]2. low quality speakers
2. antenna with poor performance that makes it difficult to receive a satellite signal
3. inaccurate geographical data
4. outdated street data
5. inefficient routing software

Question 18

usability problems with tablets

Answer 18

1. accidental touches leads to undesired slections
2. difficult to learn different gesture geatures of various manufacturers
3. poor scaling and zoom control
4. difficult to use control features
5. small side buttons
6. poorly written instructions

Question 19

usability problems of game consoles

Answer 19

1. some portable game consoples have relatively small screen
2. buttons may be too small
3. difficult to use outdoors (not enough brightness)
4. short battery life

Question 20

usability problems of PCs

Answer 20

1. excessive keyboard may lead to RSI syndrome
2. excessive use of a large, bright screen may cause eyesight problems or strain the eyes
3. poor room lighting conditions may lea to distracting refelcion on the screen
4. the mouse of a pc is designed for right-handed people

Question 21

what does RSI stand for?

Answer 21

repetitive strain injury

Question 22

usability problems of digital cameras

Answer 22

1. incorrect calibration of touch screen menus
2. need to hold the camera vertically -> doesnt allow convenient navigation through the touch screens (i.e.. auto rotate screen option would be better)
3. extra hardware component needed for inadequarte flash features
4. buttons are too small
5. some requires specific software for connection with computer to transfer files

Question 23

usability problems of mobile phones

Answer 23

1. kepyboard is very small
2. not all users need all the special features

Question 24

usability problems of mp3 devices

Answer 24

1. tuny buttons
2. insufficent memory
3. fragile - lack of a screen

Question 25

how can the usability of mp3 devices be improved?

Answer 25

• 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)

Question 26

what does NLP stand for?

Answer 26

natural language processing

Question 27

disabilities and accessibility: visual impairment (input)

Answer 27

braille input devices

Question 28

disabilities and accessibility: visual impairment (output)

Answer 28

• speech output devices to read screen text
• capability to adjust colour of display for colour blindness

Question 29

disabilities and accessibility: hearing and speech impairments (input)

Answer 29

no problem

Question 30

disabilities and accessibility:hearing and speech impairments (output)

Answer 30

• replace sound signals with visual effects
• use of subtitles

Question 31

disabilities and accessibility:cognitive problems and learning diasbilities (input & output)

Answer 31

• speical software that provides active participation and multi-sensory expereinces

Question 32

disabilities and accessibility: mobility impairments (input)

Answer 32

• 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)

Question 33

disabilities and accessibility:mobility impairments (output)

Answer 33

no problem