Dieter Rams
- Is innovative
- Makes a product useful
- Is aesthetic
- Makes a product understandable
- Is unobtrusive
- Is honest
- Is long-lasting
- Is thorough down to the last detail
- Is environmentally friendly
- Involves as little design as possible
Nielsen
- Visibility of system status
- Match between system and the real world
- User control and freedom
- Consistency and standards
- Error prevention
- Recognition rather than recall
- Flexibility and efficiency of use
- Aesthetic and minimalist design
- Help users recognize, diagnose, and recover from errors
- Help and documentation