Indian IT Exports

About 4 years ago I read a post in rediff about a Mckenzie report that projected India to achieve IT exports of $62 billion by 2008. It sounded phony and I mentioned so at that time in my blog. Today I read this article in TOI stating India achieved $50 billion in IT exports in 2008. Falling short by 20%. I really would like to know how these projections are made. I understand the need to make these projections, so that the CEOs and IT pundits and drop these numbers to project their own interests, but seriously, I do not think there is much thought behind these models.