Learning Objectives:At the end of this topic you should be able to:
• indicate how perception, attention, memory, and learning affect HCI design choices
HCI Design Factors
In trying to design an HCI which:• is easy to learn• is easy to remember• reduces user error
Factors to be considered will be:• Perception• Attention• Memory• Learning
Perception• is the input from sight and sound (& touch?)
• user will have preconceived ideas :– colours: green for go, red for stop– sound: certain sounds are perceived as happy or sad– touch: key ‘click’ when pressed haptic feedback
• need to take preconceived ideas into account:match = user thinks they can use the systemmatch = user may think they can’t use the system
Attention• a user may have a limited attention span;
So, to maintain attention:• use consistent & logical layout
– grouping of similar items - logical menu structure
– familiar data entry - top to bottom, left to right
– consistency - buttons & menus in the same place (on all screens/web pages)
– consistent use of colour
• uncluttered screen layout:– too much information disinterested user (short attention span)
• clear labels used, salient points obvious
• to gain attention use:– flashing text, pop-up messages, sounds, …..
Memory• long-term, short-term & physical memories used
• an interface may be used infrequently– so can’t rely on user remembering how to use system need to use links to pre-existing knowledge
• i.e. use user’s mental model
physical & short term memory will be involved – designer must ensure short term memory is used
• ‘keep it simple and recognisable’
To aid memory:• screen layouts should be consistent & uncluttered• use of colour should be consistent and sensible• design should link to pre-existing knowledge