- Make your contribution as informative as is required (for the current purposes of the exchange).
- Do not make your contribution more informative than is required.
- Quality: ‘Try to make your contribution one that is true’
- Do not say what you believe to be false
- Do not say that for which you lack adequate evidence.
- Relevance: ‘Be relevant’
- Manner: ‘Be perspicuous’
- Avoid obscurity of expression.
- Avoid ambiguity.
- Be brief (avoid unnecessary prolixity).
- Be orderly.