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Meaning/convention: it may be that someone who has changed a habit falls back into the old habit. Even in non-verbal cases.
I 2 f
Deviations/communication: Deviations must have good reasons.
I 419 f
Conventions (Walker, Grice Doc 10): you can not find out whether a statement transmits a relationship betw antecedent and consequent due to a special convention or whether this relationship is transmitted conversationally
H. Paul Grice
Handlung, Kommunikation, Bedeutung, Hg. Georg Meggle Frankfurt/M. 1993