The Company organizes its reporting segments based on types of organizational business. The five reporting segments  are segregated as below: Domestic fixed communications business, mobile communications business, internet business,  international fixed communications business and others. The operating segments are managed separately because each operating segment represents a strategic business unit that serves  different markets. The Company’s measure of segment performance is mainly based on revenues and income before tax. a.  Segment information ●  Others - the provision of non-telecom services and the corporate related items not allocated to reportable segments. ●  International fixed communications business - the provision of international long distance telephone services and related  services; ●  Internet business - the provision of HiNet services and related services; ●  Mobile communications business - the provision of mobile services, sales of mobile handsets and data cards, and related  services; ●  Domestic fixed communications business - the provision of local telephone services, domestic long distance telephone  services, broadband access, and related services; PART III F-57 International Domestic Fixed Mobile Fixed Communications Communications Communications  Business Business Internet  Business Business Others Adjustment Total NT$ NT$ NT$ NT$ NT$ NT$ NT$ (In Millions) (In Millions) (In Millions) (In Millions) (In Millions) (In Millions) (In Millions) Year ended December 31, 2009 Revenues from external  customers $  71,467 $  86,524 $  23,653 $  15,244 $  1,473 $  ─ $  198,361 Intersegment service revenues  13,650 1,915 717 1,523 3 (17,808) ─ Interest income 3 8 4 11 453 ─ 479 Other income 77 104 74 10 678 943 $  85,197 $  88,551 $  24,448 $  16,788 $  2,607 $  (17,808) $  199,783 Interest expense $  3 $  1 $  10 $  ─ $  1 $  ─ $  15 Depreciation and amortization 23,984 8,373 2,327 1,404 232 36,320 Other expense $  156 $  98 $  11 $2 $  279 $  ─ $  546 Segment income before tax 17,452 30,184 9,356 $  2,550 (2,304) 57,238 Total assets  $  231,177 $  63,537 $  17,154 18,700 $  118,429 $  ─ $  448,997 Capital expenditures for  segment assets  $  15,877 $  5,028 $  2,097 $  1,299 $  1,177 $  ─ $  25,478 Year ended December 31, 2010 Revenues from external  customers $  70,688 $  89,044 $  24,483 $  15,534 $  2,681 $  ─ $  202,430 Intersegment service revenues  14,662 2,117 1,104 1,720 750 (20,353) ─ Interest income 1 9 2 9 454 ─ 475 Other income 31 263 24 96 313 (170) 557 $  85,382 $  91,433 $  25,613 $  17,359 $  4,198 $  (20,523) $  203,462 Interest expense $  75 $  1 $  7 $  ─ $  24 $  ─ $  107 Depreciation and amortization 21,948 8,205 2,206 1,383 322 34,064 Other expense $  283 $  7 $  14 $  198 $  255 $  (170) $  587 Segment income before tax 18,048 29,328 9,835 2,652 (2,176) ─ 57,687 Total assets  $  227,376 $  63,330 $  17,663 $  23,535 $  122,407 $  $  454,311 Capital expenditures for  segment assets  $  14,260 $  5,261 $  1,889 $  1,787 $  1,420 $  ─ $  24,617 Year ended December 31, 2011 Revenues from external  customers $  79,351 $  92,998 $  24,834 $  15,218 $  5,092 $  ─ $  217,493 Intersegment service revenues  15,355 6,994 1,917 2,620 725 (27,611) ─ Interest income 4 8 1 3 666 ─ 682 Other income 465 130 10 41 562 (9) 1,199 $  95,175 $  100,130 $  26,762 $  17,882 $  7,045 $  (27,620) $  219,374 Interest expense $  ─ $  ─ $  4 $  ─ $  27 $  ─ $  31 Depreciation and amortization 20,139 8,288 2,278 1,282 319 32,306 Other expense $  15 $ 7 $  6 $  3 $  197 $  (9) $  219 Segment income before tax 18,482 $  27,839 9,562 2,041 (1,225) ─ 56,699 Total assets  $  227,822 64,742 $  20,323 $  24,770 $  105,263 $  $  442,920 Capital expenditures for  segment assets  $  16,569 $  4,334 $  3,746 $  1,529 $  698 $  ─ $  26,876