Computers and Disability Case Study IB Computer Science II Paul Bui.

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Presentation transcript:

Computers and Disability Case Study IB Computer Science II Paul Bui

What are the five senses?

What are the three components of a computer system?

What gives people problems? Issue Input Device Output Device dexterity hearing sight

Touch / Dexterity Disabilities Limited use of fingers and limbs Carpal tunnel syndrome! Others?

Head mice

Eye-tracking

Ergonomic mice

Ergonomic Keyboards

How would you input text on the screen without a keyboard?

What solutions could we create for hearing impairment?

Electronic Reading Aids Scanner reads text Translates to output format for user  Magnified text  Speech output  Braille

Screen magnifier Start  Accessories  Accessibilty Different from a video magnifier  Video magnifier uses a camera

Electronic Braille Display Sneakers clip

Notetakers

Other vision impairments Color-blindness  Solution  use contrasting colors  Convert and view in grayscale

Example Question 1 Design a computer system to be used by a person with a vision impairment.

Example Question 2 A computer laboratory has been specifically equipped for use by visually impaired students. (a) Outline how an electronic reading aid will enable these students to access printed notes handed out on paper by teachers. [3 marks] (b) Apart from an electronic reading aid, describe how another hardware feature of this laboratory could allow better access to information for students with (i) limited sight [2 marks] (ii) no sight. [2 marks]

Example Question 3 The company that designed the laboratory used a prototyping approach when designing the user interfaces for these computers. (c) Outline how this approach would involve the intended users. [3 marks] (d) Outline how the following users could reliably enter text into a computer system: (i) A person who is unable to see. [2 marks] (ii) A person who is unable to use their hands to enter text. [2 marks]

Example Question 4 A student is designing a stock control system for a small shop. The system is designed to read barcodes from products. When a barcode is successfully scanned, the system issues a beep. (e) Compare two different ways in which the student could collect information at the analysis stage from one of the staff who is hearing impaired. [6 marks] (f) Explain how the system might need to be modified for the hearing impaired. [2 marks]

Example Question 5 For the following prototypes, outline how each one could be used by operators with a range of disabilities. (i) A series of screen drawings showing the user interface. [2 marks] (ii) A programmed prototype (e.g. Java, Visual Basic) which uses a normal keyboard. [2 marks] (iii) A programmed prototype which uses physical switches to operate the user interfaces. [2 marks]

Example Question 6 (h) Outline three ways in which voice recognition systems can assist disabled computer users.

Example Question 7 An engineer is developing a voice- activated system for control of a wheelchair. (i) Describe three situations or environments which the engineer should include when testing the system.