Intro

Qualities that must be accommodated in a systems architecture over and above basic functionality.
Categories of quality attributes:
- Observable attributes. e.g:
  - Performance
  - Usability
  - Functionality
  - Security
  - Availability
- Unobservable attributes. e.g:
  - Modifiability
  - Reusability
  - Testability
  - Portability
  - Certifiability
- Business attributes.e.g:
  - Time to market
  - Overall cost
  - Longevity
  - Backward compatibility

Quality Attribute Scenarios