human-computer interaction source: p.m.heathcote a level ict chapter 61
TRANSCRIPT
Human-computer Interaction
Source: P.M.Heathcote
A Level ICT
Chapter 61
ICT5
Computers in the workplace
Applying ergonomics to the office environment: Lighting
chosen for brightness, contrast, glare, blinds etc Furniture
must be comfortable and adjustable Environmental considerations
energy-efficient computer systems
ICT5
Vision important information should not be displayed in
blue text - the eye is less sensitive to blue 8% of males and 1% of females are colour-blind no interface should depend on everyone being
able to distinguish colours Hearing
Sound is commonly used for warnings e.g. illegal operation; Mac SonicFinder uses ‘auditory icons’
Psychological factors VisionVision
important information should not be displayed in important information should not be displayed in blue text - the eye is less sensitive to blueblue text - the eye is less sensitive to blue
8% of males and 1% of females are colour-blind8% of males and 1% of females are colour-blind no interface should depend on everyone being no interface should depend on everyone being
able to distinguish coloursable to distinguish colours HearingHearing
Sound is commonly used for warnings e.g. illegal Sound is commonly used for warnings e.g. illegal operation; Mac SonicFinder uses ‘auditory icons’operation; Mac SonicFinder uses ‘auditory icons’
VisionVision important information should not be displayed in important information should not be displayed in
blue text - the eye is less sensitive to blueblue text - the eye is less sensitive to blue 8% of males and 1% of females are colour-blind8% of males and 1% of females are colour-blind no interface should depend on everyone being no interface should depend on everyone being
able to distinguish coloursable to distinguish colours HearingHearing
Sound is commonly used for warnings e.g. illegal Sound is commonly used for warnings e.g. illegal operation; Mac SonicFinder uses ‘auditory icons’operation; Mac SonicFinder uses ‘auditory icons’
ICT5
Psychological factors - continued
Touch important in keyboard and mouse design.
Movement users may find it difficult to manipulate small
objects so targets should be reasonably large Memory
present information intuitively, in easily-memorised portions
ICT5
Designing good software Study software design to see what makes it good:
observe people interacting with computers what do they find easy which parts lead them to make more errors
Human-Computer Interaction (HCI) design cycle
Participate in
Studied by
Talk to and observe
Reveals
Contributes to
Users
Usability testing
Design Weaknesses
Design Improvements
HCI Researchers
ICT5
Good User Interfaces Provide:
Help for novice users Short cuts for experts Meaningful images Consistent behaviour Clear, helpful error messages Uncluttered screens with effective use of colour and text that is
easy to read. Text vs Graphics
GUIs are generally easier to use Sometimes it is quicker for an expert to type commands Overuse of GUIs can slow the system down