Usability v. Accessibility, Problems to solve

1. characteristic of problems

1.1. Depends on User

1.2. Depends on Software

2. Universal Usability/Accessibility/Design

3. Does not require beyond user's skill

3.1. Language

3.1.1. Can understand

3.1.1.1. Easy to understand

3.2. Computer

3.3. Professional

4. Accessibility

5. Does not require beyond user's limit

5.1. physical

5.1.1. hearing

5.1.2. seeing

5.1.3. touch/pressing

5.1.3.1. multiple key

5.1.4. reacting

5.2. mental

5.2.1. memory

6. Usability

7. Does not make user unplesent

7.1. Discrimination

7.1.1. Racal

7.1.2. Religious

7.1.3. Political

7.2. "Gotcha"s

8. Easy to learn and remember

8.1. Present useful information beyond mere data

8.2. Allow user focus on their task

8.2.1. Do not take control from user

8.2.2. Do not force meaningless/irrelevant decision

9. Error managment

9.1. Hard to make mistake

9.2. Capable to undo

9.3. No critical loss

10. Care about user's difference

10.1. What users do?

10.2. What they are interested to know?

11. Context of the system

11.1. physical enviroment

11.2. cooperating with other devices

12. I don't know