The current issue of EDUCAUSE Review focuses on green computing, and in relation to that, includes this article on cloud computing. As the authors note, the idea o offloading computing services is not new - readers may recall the whole 'software as a service' (SaaS) rage a few years ago. Now we are also seeing 'infrastructure as a service' and 'platform as a service'. There are different sourcing models for these services - commercial, institutional, and consortium sourcing.
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