Two tests to evaluate Cloud economics
Conclusion: While it appears that every known test to evaluate cloud computing has been done, there are two which determine the accuracy of any savings claimed. Indeed, they could be applied to any evaluation of IT savings and not the cloud alone.
To a large degree the tests discussed here challenge some processes of cost assessment, but IT executives ought to look for better ideas and arguments. It should be possible to ask questions of consultants and vendors in order to obtain better answers.