Decentralised co-operative multi-agent systems are computational systems where conflicts are frequent due to the nature of
the represented knowledge. Negotiation methodologies, in this case argumentation based negotiation methodologies, were developed
and applied to solve unforeseeable and, therefore, unavoidable conflicts.
The supporting computational model is a distributed belief revision system where argumentation plays the decisive role of
revision. The distributed belief revision system detects, isolates and solves, whenever possible, the identified conflicts.
The detection and isolation of the conflicts is automatically performed by the distributed consistency mechanism and the resolution
of the conflict, or belief revision, is achieved via argumentation.
We propose and describe two argumentation protocols intended to solve different types of identified information conflicts:
context dependent and context independent conflicts. While the protocol for context dependent conflicts generates new consensual
alternatives, the latter chooses to adopt the soundest, strongest argument presented. The paper shows the suitability of using
argumentation as a distributed decentralised belief revision protocol to solve unavoidable conflicts.