This excerpt taken from the PBR 6-K filed Aug 14, 2006.
Consolidated Assets by Business Area - 03.31.2006
In order to align the financial statement of each business segment with the best practices of companies in the Oil & Gas sector and to improve the understanding of Petrobras management, starting in the 1Q-2006, the Company switched to allocating all financial results and items of financial nature to the corporate level. As a result of this change, the income tax, employee profit share and minority interest line items were adjusted.
To facilitate comparisons, we have presented segmented financial statements for prior periods in accordance with new criteria.