IHS Inc. Change in Calculation of Segment Operating Income Beginning Q1 2007, we have changed our methodology for calculating and reporting segment operating income. Previously, we had allocated a large portion of our corporate costs to our two operating segments-Energy and Engineering. We continue to consolidate back-office functions and move to a shared services model. As we change the way we manage the business, we reflect that change in the way we report our segment operating income and we will no longer allocate corporate, or Shared Services, costs to the segments. Rather, we now present our Shared Services in a separate category alongside our Energy and Engineering segment disclosures. This change will have no effect on how we calculate Adjusted EBITDA. The following schedules are designed to help investors bridge the transition from our historical segment operating income calculation to the new segment operating income calculation. Schedule I - This schedule shows segment operating income by quarter for 2005 and 2006 as calculated under the new methodology, the old methodology (i.e., as published) and the difference, which was the Shared Services costs allocation. Schedule II - This schedule presents the revised reconciliations of segment operating income per the new methodology to Adjusted EBITDA for 2006 by quarter. Schedule III - This schedule presents the revised reconciliations of segment operating income per the new methodology to Adjusted EBITDA for 2005 by quarter. IHS Inc. Change in Calculation of Segment Operating Income By Quarter: 2005 - 2006 (in 000s) SCHEDULE I Q1 2005 Q2 2005 Q3 2005 Q4 2005 FY 2005 New Segment Operating Income Shared Energy Engineering Services $ 14,682 $ 8,601 $ (4,524) $ $ 14,050 $ 3,104 $ (4,116) $ $ 17,114 $ 1,731 $ (12,899) $ $ 17,529 $ 14,930 $ (8,350) $ $ 63,376 $ 28,365 $ (29,889) $ Total IHS 18,759 13,038 5,946 24,109 61,852 Old Segment Operating Income - As Published Total Energy Engineering Adjustments IHS $ 12,283 $ 6,202 $ 274 $ 18,759 $ 11,779 $ 833 $ 426 $ 13,038 $ 14,725 $ (658) $ (8,121) $ 5,946 $ 14,215 $ 11,617 $ (1,723) $ 24,109 $ 53,003 $ 17,993 $ (9,144) $ 61,852 Energy $ 2,399 $ 2,271 $ 2,389 $ 3,314 $ 10,373 Difference Shared Engineering Services $ 2,399 $ (4,798) $ 2,271 $ (4,542) $ 2,389 $ (4,778) $ 3,313 $ (6,627) $ 10,372 $ (20,745) Q1 2006 Q2 2006 Q3 2006 Q4 2006 FY 2006 $ $ $ $ $ 21,413 18,560 21,779 18,433 80,185 $ $ $ $ $ $ 3,045 $ 3,524 $ 3,924 $ 5,202 $ 15,696 $ $ $ $ $ 19,193 19,934 20,813 22,930 82,873 $ $ $ $ $ 11,270 8,815 11,987 14,738 46,808 $ $ $ $ $ (9,050) (10,189) (11,021) (19,235) (49,496) $ $ $ $ $ 16,148 16,410 16,889 17,728 67,177 $ $ $ $ $ 8,225 5,291 8,062 9,536 31,112 $ $ $ $ $ (2,960) (3,141) (3,172) (8,831) (18,104) $ $ $ $ $ 21,413 18,560 21,779 18,433 80,185 3,045 3,524 3,925 5,202 15,696 Total IHS $ $ $ $ $ - $ (6,090) $ $ (7,048) $ $ (7,849) $ $ (10,404) $ $ (31,392) $ - IHS Inc. Revised Reconciliations of Segment Operating Income to Adjusted EBITDA By Quarter: 2006 (in 000s) SCHEDULE II Operating income Adjustments: Stock-based compensation expense CEO retirement costs Depreciation and amortization Restructuring and offering charges (Gain) loss on sales of assets, net Net periodic pension and post-retirement benefits Minority interest Adjusted EBITDA Operating income Adjustments: Stock-based compensation expense CEO retirement costs Depreciation and amortization Restructuring and offering charges (Gain) loss on sales of assets, net Net periodic pension and post-retirement benefits Minority interest Adjusted EBITDA Operating income Adjustments: Stock-based compensation expense CEO retirement costs Depreciation and amortization Restructuring and offering charges (Gain) loss on sales of assets, net Net periodic pension and post-retirement benefits Minority interest Adjusted EBITDA Three Months Ended February 28, 2006 Shared Total Energy Engineering Services IHS $ 19,193 $ 11,270 $ (9,050) $ 21,413 $ 1,701 20,894 $ 1,460 (18) (25) 12,687 $ 3,666 3,666 209 3,370 20 2 (726) (726) (25) (5,881) $ 27,700 Three Months Ended August 31, 2006 Shared Total Energy Engineering Services IHS $ 20,813 $ 11,987 $ (11,021) $ 21,779 $ 2,584 23,397 $ 1,301 53 (89) 13,252 $ 4,440 4,440 333 4,218 53 (1,268) (1,268) (89) (7,516) $ 29,133 Year Ended November 30, 2006 Shared Total Energy Engineering Services IHS $ 82,873 $ 46,808 $ (49,496) $ 80,185 $ 8,935 444 92,252 $ 21,702 21,702 1,857 1,857 5,673 1,106 15,714 1,836 823 3,103 56 56 (4,421) (4,421) (168) (168) 54,205 $ (28,429) $ 118,028 Three Months Ended May 31, 2006 Shared Total Energy Engineering Services IHS $ 19,934 $ 8,815 $ (10,189) $ 18,560 $ 1,805 21,739 $ 1,266 (56) 10,025 $ 4,359 4,359 271 3,342 (1,218) (1,218) (56) (6,777) $ 24,987 Three Months Ended November 30, 2006 Shared Total Energy Engineering Services IHS $ 22,930 $ 14,738 $ (19,235) $ 18,433 $ 2,845 444 26,219 $ 1,646 1,854 3 2 18,243 $ 9,237 9,237 1,857 1,857 293 4,784 803 3,101 3 (1,209) (1,209) 2 (8,254) $ 36,208 IHS Inc. Revised Reconciliations of Segment Operating Income to Adjusted EBITDA By Quarter: 2005 (in 000s) SCHEDULE III Operating income Adjustments: Stock-based compensation expense CEO retirement costs Depreciation and amortization Restructuring and offering charges (Gain) loss on sales of assets, net Net periodic pension and post-retirement benefits Minority interest Adjusted EBITDA Operating income Adjustments: Stock-based compensation expense CEO retirement costs Depreciation and amortization Restructuring and offering charges (Gain) loss on sales of assets, net Net periodic pension and post-retirement benefits Minority interest Adjusted EBITDA Operating income Adjustments: Stock-based compensation expense CEO retirement costs Depreciation and amortization Restructuring and offering charges (Gain) loss on sales of assets, net Net periodic pension and post-retirement benefits Minority interest Adjusted EBITDA Three Months Ended February 28, 2005 Shared Total Energy Engineering Services IHS $ 14,682 $ 8,601 $ (4,524) $ 18,759 Three Months Ended May 31, 2005 Shared Total Energy Engineering Services IHS $ 14,050 $ 3,104 $ (4,116) $ 13,038 1,672 $ 16,354 1,638 $ 15,688 $ 1,040 7 9,648 $ 1,274 1,274 195 2,907 (617) (617) (931) (931) 7 (4,603) $ 21,399 $ 1,024 3 11 4,142 $ 1,230 1,230 197 2,859 (717) (714) (939) (939) 11 (4,345) $ 15,485 Three Months Ended August 31, 2005 Shared Total Energy Engineering Services IHS $ 17,114 $ 1,731 $ (12,899) $ 5,946 Three Months Ended November 30, 2005 Shared Total Energy Engineering Services IHS $ 17,529 $ 14,930 $ (8,350) $ 24,109 1,598 $ 18,712 1,609 $ 19,138 $ 979 4,406 (32) 7,084 $ 1,041 1,041 196 2,773 7,991 12,397 (911) (911) (32) (4,582) $ 21,214 Year Ended November 30, 2005 Shared Total Energy Engineering Services IHS $ 63,376 $ 28,365 $ (29,889) $ 61,852 6,517 $ 69,893 $ 5,272 5,272 4,118 784 11,419 4,406 9,297 13,703 3 (1,334) (1,331) (4,091) (4,091) (116) (30) (146) 36,776 $ (19,991) $ 86,678 $ 1,075 (102) 15,903 $ 1,727 1,727 196 2,880 1,306 1,306 (1,310) (1,310) (30) (132) (6,461) $ 28,580