Human Interface Guidelines

https://developer.apple.com/design/human-interface-guidelines/macos/overview/visual-index/

Testing Methodology
https://webaccess.its.uiowa.edu/testing/alt-text.html

Wave toolbar
http://wave.webaim.org/toolbar/

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Application Types or Tiers

Tier 1 application: An information system that is vital to the running of an organization.
Example: Software used to run Trains, Flights, Operation theaters…etc

Tier 2 application: This will cause interruption, but not critical.
Example: Ticketing software, Classroom software,…etc

Tier 3 application: Nonimportant. Without them, business operations will continue.
Example: knowledge search software, Homework software,…etc

The view will change based on ownership and need of business.
Based on the tier, the architecture will be defined for the following
1. High Availability
2. Scalability
3. Security
…etc

-o-

Business Tiers
https://www.quora.com/What-is-the-difference-between-tier-1-tier-2-and-tier-3-business