HUMAN-COMPUTER NTERACTION layout-QWERTy Standardised layout but non-alphanumeric keys are placed differently accented symbols needed for different scripts minor differences between UK and USa keyboards QWERTY arrangement not optimal for typing layout to prevent typewriters jamming Alternative designs allow faster typing but large social base of QWerTY typists produces reluctance to change
layout – QWERTY • Standardised layout but … – non-alphanumeric keys are placed differently – accented symbols needed for different scripts – minor differences between UK and USA keyboards • QWERTY arrangement not optimal for typing – layout to prevent typewriters jamming! • Alternative designs allow faster typing but large social base of QWERTY typists produces reluctance to change
HUMAN-COMPUTER NTERACTION QWERTy (ctd) ④(2)O3)④4(⑤)68)9(○ ⑥Gxc(BMx○ SPACE
QWERTY (ctd) 2 3 4 5 6 7 8 9 0 Q W E R T Y U I 1 O P A S D F G H J K L Z X C V B N M , . SPACE
HUMAN-COMPUTER NTERACTION alternative keyboard layouts Alphabetic keys arranged in alphabetic order not faster for trained typists not faster for beginners either. Dvorak common letters under dominant fingers biased towards right hand common combinations of letters alternate between hands 10-15%improvement in speed and reduction in fatigue But-large social base of QWERTY typists produce market pressures not to change
alternative keyboard layouts Alphabetic – keys arranged in alphabetic order – not faster for trained typists – not faster for beginners either! Dvorak – common letters under dominant fingers – biased towards right hand – common combinations of letters alternate between hands – 10-15% improvement in speed and reduction in fatigue – But - large social base of QWERTY typists produce market pressures not to change
HUMAN-COMPUTER NTERACTION special keyboards o designs to reduce fatigue for rsi ● for one handed use e.g. the maltron left-handed keyboard eBla 8
special keyboards • designs to reduce fatigue for RSI • for one handed use e.g. the Maltron left-handed keyboard
HUMAN-COMPUTER NTERACTION Chord keyboards only a few keys -four or 5 letters typed as combination of keypresses compact size ideal for portable applications short learning time keypresses reflect letter shape ◇ fast once you have trained BUT -social resistance, plus fatigue after extended use NEW- niche market for some wearables
Chord keyboards only a few keys - four or 5 letters typed as combination of keypresses compact size – ideal for portable applications short learning time – keypresses reflect letter shape fast – once you have trained BUT - social resistance, plus fatigue after extended use NEW – niche market for some wearables