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This paper presents an adaptive and self-organizing Peer-to-Peer (P2P) computing grid. The proposed solution, named ad hoc Grid, leverages on the OurGrid (OG) middleware, which is an open source P2P computing grid. OG requires some centralized administration, preventing it to be used for deploying spontaneous (ad hoc) computing grids. To make the P2P grid adaptive and self-organizing, new approaches...