I see a lot of cloud computing projects fail in that they do not bring the promised ROI. In my book, if a project cannot live up to the projected ROI, it has failed.
There are three common cloud mistakes that lead to such ROI failure, each of which you can easily avoid.
Mistake 1: You miss the security boat
I know I sound like a broken record, but security is systemic to everything cloud. Cloud designers are architects, and they need to make sure security is considered at every point, including requirements, design, migration, testing, and operations.