I have spent several hours today reading about various takes on calculating the ROI on cloud computing and the consensus seems to be that it is nebulous. Though, one can break down the cloud into various buckets, such as: hardware, software administration, provisioning, etc.
These buckets may assist in the overall ROI of the cloud, but my experience is that a Business Analyst/Manager type uses ROI to build a business case for going to the cloud for a specific, not as much a CIO. So, in that case I believe a TCO for an internal solution could be used for calculating the ROI for a one-off app going to the cloud.
At the end of the day, you need a number the CxO will be satisfied with. The how you came about that number may not be questioned.
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