Class notes

Introduction to Computers Note

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Course
420-BWC-03

Institution
Dawson College ( )

This document contains the following topics: Accessibility: measure of how easy a service or product is to use, notably for people with disabilities ( more detailed in the doc ) HardWare and Software Data Storage: have multiple different levels of data storage

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Uploaded on September 6, 2022
Number of pages 11
Written in 2022/2023
Type Class notes
Professor(s) No mention
Contains All classes

hardware
software
drives
storage
bits
bytes
binary numbers
computer
science
accessibility
data
data storage

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Computer Science Lecture 3 Accessibility

Definition: Accessibility is a measure of how easy a service or product is to use, notably for
people with disabilities

Accessibility also encompasses ensuring equal opportunity regardless of:

- Physical disability
- Cognitive
- Econo Background: some region not have full accessibility remote internet access ,
issue high cost ( registration fees )
- Language: language can be a barrier
- Race/ Ethnicity
- Gender /Sexuality: different accessibility issues ( sexual history )

POUR
● Perceivable - Content is comprehensible
● Operable - Interaction with design should be possible
● Understandable - Design is easy to follow
● Robust - Design should not fail with repeated use

Accessibility is a Human Right and is protected …

Universal Design
‘’ Universal is the design and composition of an environment so that it can be accessed,
understood and used to the greatest…’’

Universal Design Principles link on PPT

All individuals should have as close to the same experience
One universal service instead of many accessible ones

ex: Class 2 doors one in the back one in the front ( how is this related to computers? )

Display – Visual Disabilities

Content should be perceivable for ALL users

Color Blindness: Users might have difficulty to see specific text, as it may be perceived as
the same color as it’s background

, Vision Impairment: Small text or text which is low contrast might be hard to read ( how
different two colors , hard to differentiate text color and background )

Blindness: Some users might require screen readers…

Ensuring Accessibility – Visual Disabilities

Contrast Checkers: There are tools online to check if the contrast between your background
and text colours is a high enough contrast to be easy to perceive.

Colour Correction Software: Colour Filters change the colours of the screen to make it
easier for you to see. Different filters have different purposes.

Screen Readers/ Alt Text: Screen Readers read the text on screen to a computer user. They
can only read text! If you have a picture or graph, make sure to add Alt-Text!

Alt-text is a text description for images that won’t show on screen. (Only read by Screen
Readers)

Audio – Hearing Disabilities

Content should be perceivable for all users

Deafness: If content is audio based in any way, then a transcript or closed captions should be
provided.

Ensuring Accessibility – Hearing Disabilities

Automatic Captioning: Many video conferencing softwares ( such as Microsoft Teams) allow
for auto captioning

Transcripts: ex: ytb has captions/ subtitles

Content – Cognitive D.
Content should be understandable for all users

Ease of Language: Complex language can be hard to understand and present a gateway for
many users.

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