This position paper connects the areas and communities of abstract argumentation and attack-defence trees in the area of security. Both areas deal with attacks, defence and support and both areas rely on applications dealing with human aggressive activities. The unifying idea we use in this paper is to regard arguments as AND-OR attack trees as proposed by Schneier in the security domain. The core model, which is acceptable for both communities, is a pair (S, (→)), where S is a set of attack trees (the "arguments") and (→) is a binary relation on attack trees (the "attack" relation). This leads us to the notion of an attack-defence framework, which provides an argumentation-based semantics for attack-defence trees and more general attack-defence graphs.
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