Nowadays the grid community is facing complex challenges. Among them three are particularly interesting: the existence of many different grid middlewares; the increasing complexity of the submitted jobs; and the many different ways in which actors and resources can be arranged. In this paper we propose a combined solution to these problems which is based on the union of two concepts: a metagrid concept that tackles the issues posed by the variety of differentmiddlewares and the complexity of jobs, and a concept of Social Grid Agents that tackles the issue of resource sharing and allocation.
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