Grace's maxims are from Paul Grice philosopher that studied the language and idioms. It comes from him the conversational implicature concept.
Grice maxims about what specify maxims :
## Quantity
1. Should be adequately informative and provide enough details
2. We shouldn't be more informative than required. Do not provide too many details.
## Quality
1. Should not be false. Provide exact information.
2. Don't claim when you don't have sufficient evidences. Fact check as much as possible to provide clear information, according to the first point.
## Relations
1. Say relevant things. Things that don't interest anyone is boring.
## Manner
1. Don't show big vocabulary. Communication is also about talking the same language as the person with whom you talk. Use the same cluster concepts and vocabulary field.
2. Avoid ambiguity. Ambiguity is created when the sense of one or more sentences aren't evidently meaning what they should mean.
3. Be brief. Information should be straight to the point in order to avoid losing the interlocutor.
4. Be orderly, don't miss steps in communication. Composeyour thoughts before talking.
## Flouting maxims
Any flouting maxims is distinguent the communication. Make a breaking in those rules to create a communicative point. I.e : by breaking the rules 1. of Quality, you create sarcasm.