Trust is a natural mechanism by which an autonomous party, an agent , can deal with the inherent uncertainty regarding the behaviours of other parties and the uncertainty in the information it shares with those parties. Trust is thus crucial in any decentralised system. This paper builds on recent efforts to use argumentation to reason about trust. Specifically, a set of schemes is provided, and abstract patterns of reasoning that apply in multiple situations geared towards trust. Schemes are described in which one agent, A , can establish arguments for trusting another agent, B , directly, as well as schemes that A can use to construct arguments for trusting C , where C is trusted by B . For both sets of schemes, a set of critical questions is offered that identify the situations in which these schemes can fail.
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