Dung's argumentation approach is a unifying approach which has played an influential role on argumentation research and Artificial Intelligence (AI). Based on a proper representation of Dung's argumentation approach and minimal models, we introduce a novel argumentation semantics called preferred+ semantics which follows the preferred semantics' philosophy. Also, we show how to infer preferred+ semantics using a software tool called SI-COBRA that was introduced recently. Key words Argumentation, Logic programming, subgraph isomorphism.