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I've been wondering on this for a while; I identify the following main differences between current Grids and current Clouds so far: - Grid systems are designed for collaborative sharing of resources belonging to different admin domains, while Clouds at the moment expose the resources of one domain to the outside world - Grid systems support the execution of end-users applications as computational activities; a typical computational activity once accepted by a Grid endpoint, is locally handled by a batch system as a batch job; Clouds are mainly used for the remote deployment of services -- this is an important difference; Grids provide more domain-specific services; Clouds can sit below (the RightGrid can be a typical example of this) -- Grids are moving towards the adoption of virtual machine tecnologies, but the usage pattern will be the same (the submitted job is bound with the execution environment as VM image) - Grid systems support large set of users organized in virtual organizations (credentials are typically enriched with VO-related information); Cloud systems support individual users (to my knowledge) I would not see the size of allocation as a factor for differentiating them.