Exam (elaborations)
INF1520 Assignment 3 2024 - DUE 15 July 2024
- Institution
- University Of South Africa (Unisa)
INF1520 Assignment 3 2024 - DUE 15 July 2024 QUESTIONS WITH DETAILED ANSWERS
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[Company name]INF1520
Assignment 3 2024
- DUE 15 July 2024
QUESTIONS WITH DETAILED ANSWERS
, INF1520 Assignment 3 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)
1.2 There are, potentially, many mistakes that designers can make when designing interfaces.
Specify what are the most problematic mistakes designers make. (3)
1.3 Name and explain three common design mistakes users make when designing interfaces?
(6)
1.1 Why the keys on a computer keyboard are arranged in the order of QWERTY
The QWERTY keyboard layout was designed in the 1870s by Christopher Latham Sholes, who
invented the typewriter. The reasons for this specific arrangement include:
1. Typewriter Jamming: Early typewriters would jam if adjacent keys were pressed in quick
succession. The QWERTY layout was developed to reduce the likelihood of jamming by
spacing out commonly used letter pairs.
2. Typing Efficiency: The layout places frequently used letters in positions that can be easily
reached to improve typing speed and efficiency, considering the mechanics of early
typewriters.
3. Adoption and Standardization: Once the layout was adopted and typewriters became widely
used, it became a standard. Changing the layout would have required significant retraining and
redesign of typewriters, so it remained as the default.
4. Economic and Practical Factors: As QWERTY keyboards became standard, manufacturers
continued to produce them, reinforcing their use despite the existence of potentially more
efficient layouts like Dvorak.
1.2 Common Mistakes Designers Make When Designing Interfaces
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