The government implemented a number of changes in how it calculates GDP. For example, research and development spending will now be treated as investment, and defined benefit pension plans will be measured on an accrual basis, rather than as cash.
Read More>http://www.bdlive.co.za/world/americ...tick-in-growth

They actually changed more than just this in how they estimate GNP, I'll try to find it and post it in this thread.