T. SEGMENT INFORMATION Teradyne has four reportable segments (Semiconductor Test, System Test, Industrial Automation and Wireless Test). Each of the Semiconductor Test, System Test, and Wireless Test segments is also an individual operating segment. The Industrial Automation reportable segment consists of operating segments with discrete financial information, which have been combined into one reportable segment as they share similar economic characteristics, types of products, production processes and distribution channels. On September 15, 2020, Teradyne announced the appointment of Gregory Smith as President of Teradynes Industrial Automation reportable segment effective October 1, 2020. With the appointment of Gregory Smith, the Industrial Automation reportable segment will become an individual operating segment. The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services. The System Test segment includes operations related to the design, manufacturing and marketing of products and services for defense/aerospace instrumentation test, storage and system level test, and circuit-board test. The Industrial Automation segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms, autonomous mobile robots and advanced robotic control software. The Wireless Test segment includes operations related to the design, manufacturing and marketing of wireless test produc t s and services. Teradyne evaluates performance based on several factors, of which the primary financial measure is business segment income (loss) before income taxes. The accounting policies of the business segments in effect are described in Note B: Accounting Policies in Teradynes Annual Report on Form 10-K for the year ended December 31, 2019. Segment information for the three and nine months ended September 27, 2020 an d September 29, 2019 is as follows: Semiconductor Test System Test Industrial Automation Wireless Test Corporate and Other Consolidated (in thousands) Three Months Ended September 27, 2020 Revenues $ 592,141 $ 118,169 $ 68,711 $ 40,504 $ (41 ) $ 819,484 Income (loss) before income taxes (1)(2) 189,116 47,368 (5,302 ) 10,938 21,611 263,731 Total assets (3) 1,069,830 155,642 667,132 108,671 1,435,237 3,436,512 Three Months Ended September 29, 2019 Revenues $ 397,737 $ 73,305 $ 68,892 $ 42,264 $ (160 ) $ 582,038 Income (loss) before income taxe s (1) (2) 116,633 24,381 (1,645 ) 11,182 1,182 151,733 Total assets (3) 757,422 126,452 580,635 94,789 1,139,493 2,698,791 Nine Months Ended September 27, 2020 Revenues $ 1,735,777 $ 306,051 $ 187,792 $ 133,174 $ (294 ) $ 2,362,500 Income (loss) before income taxes (1)(2) 571,719 114,968 (32,041 ) 35,640 (12,197 ) 678,089 Total assets (3) 1,069,830 155,642 667,132 108,671 1,435,237 3,436,512 Nine Months Ended September 29, 2019 Revenues $ 1,113,489 $ 204,934 $ 209,753 $ 112,541 $ (402 ) $ 1,640,315 Income (loss) before income taxes (1)(2) 291,037 63,254 (10,670 ) 25,740 7,528 376,889 Total assets (3) 757,422 126,452 580,635 94,789 1,139,493 2,698,791 (1) Included in Corporate and Other are: contingent consideration adjustments, employee severance charges, interest (income) and expense , net foreign exchange (gains) and losses, pension and postretirement plan actuarial (gains) and losses and settlement charges, intercompany eliminations, and certain acquisition related charges and compensation. (2) Included in income (loss) before taxes are charges and credits related to restructuring and other, and inventory charges. (3) Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets. Included in each segment are charges and credits in the following line items in the statements of operations: For the Three Months Ended For the Nine Months Ended September 27, September 29, September 27, September 29, 2020 2019 2020 2019 (in thousands) Semiconductor Test: Cost of revenues - inventory charge $ 1,131 $ 1,867 $ 7,956 $ 5,319 Restructuring and other - contract termination settlement fee   4,000  Restructuring and other - employee severance    1,009 Wireless: Cost of revenues - inventory charge $ 1,802 $ 724 $ 3,957 $ 1,892 Restructuring and other - employee severance    566 Industrial Automation: Cost of revenues - inventory charge $  $  $ 505 $ 508 Restructuring and other - acquisition related compensation and expenses   790 1,330 Restructuring and other - employee severance   664 604 System Test: Cost of revenues - inventory charge $  $  $ 698 $ 1,129 Corporate and Other: Restructuring and other - AutoGuide contingent consideration adjustment $ (27,206 ) $  $ (4,421 ) $  Restructuring and other - acquisition related compensation and expenses (1,086 ) 816 2,629 928 Restructuring and other - MiR contingent consideration adjustment  (7,759 ) (3,546 ) (16,427 ) Selling and administrative - equity modification charge  2,108  2,108