IDC is estimating the future based on current trends so they needed final 2012 figures to go forward. X360 & PS3 declined in Q4 2012 from last year, so just take their Q4 2011 figures and add that to Q3 2012 as a maximum for where they are through the end of 2012.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu







