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  5. Human Computer Interaction I (INF1520)

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INF1520 Assignment 3 (COMPLETE ANSWERS) 2024 - DUE 15 July 2024
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Exam study book Human-computer Interaction of Alan Dix, Janet Finlay, Gregory D. Abowd, Russell Beale - ISBN: 9780130461094 (Guaranteed success)

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INF1520

Assignment 3

(COMPLETE

ANSWERS) 2024 -

DUE 15 July 2024

, INF1520 Assignment 3 (COMPLETE ANSWERS) 2024 -

DUE 15 July 2024

Question 1 [13]

1.1 Explain why the keys on a computer keyboard are

arranged in the order of QWERTY. (4)



The QWERTY keyboard layout, devised by Christopher Sholes
in the 1860s for early typewriters, was a solution to several key
challenges of that era:
1. Jamming Prevention: Sholes strategically placed
commonly paired letters apart to prevent the mechanical
arms of early typewriters from jamming when pressed in
quick succession.
2. Typist Efficiency: Despite its initial intent to slow typists
down to prevent jams, the QWERTY layout also allowed
trained typists to achieve a rhythm by alternating between
hands, which could increase efficiency over time.
3. Historical Legacy: Once QWERTY became the standard
for typewriters, its adoption was cemented through
manufacturing and training, making it difficult to shift to
alternative layouts despite their potential advantages.



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, 4. Modern Relevance: Despite criticisms about its efficiency
compared to layouts like Dvorak or Colemak, QWERTY
remains dominant due to its widespread familiarity, support
from software and hardware manufacturers, and the inertia
of historical adoption.
In summary, the QWERTY layout's design aimed to address
mechanical limitations and promote efficiency for early typists,
leading to its enduring legacy in today's digital keyboards and
devices.


1.2 There are, potentially, many mistakes that designers

can make when designing interfaces. Specify what

are the most problematic mistakes designers make.

(3)

Not Testing Usability: Designers sometimes skip usability

testing, missing opportunities to identify and address

usability issues before the interface is launched.




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