S. SEGMENT INFORMATION

Teradyne has four operating segments (Semiconductor Test, System Test, Industrial Automation and Wireless Test), which are its reportable segments. 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 test and circuit-board test. The Industrial Automation segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms and advanced robotic control software. The Wireless Test segment includes operations related to the design, manufacturing and marketing of wireless test products and services. Each operating segment has a segment manager who is directly accountable to and maintains regular contact with Teradyne’s chief operating decision maker (Teradyne’s chief executive officer) to discuss operating activities, financial results, forecasts, and plans for the segment.

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 Teradyne’s Annual Report on Form 10-K for the year ended December 31, 2017, and Note B: “Accounting Policies” in this filing for any changes in the three months ended April 1, 2018.

Segment information for the three months ended April 1, 2018 and April 2, 2017 is as follows:


	Semiconductor Test		System Test			Industrial Automation			Wireless Test		Corporate and Other			Consolidated
	(in thousands)
*Three Months Ended April 1, 2018*
Revenues	$	373,328	$	43,019		$	48,834		$	22,507	$	(221	)	$	487,467
Income before income taxes (1)(2)		88,079		5,888			784			464		605			95,820
Total assets (3)		758,737		90,785			406,557			59,739		1,679,375			2,995,193
*Three Months Ended April 2, 2017*
Revenues	$	355,528	$	39,845		$	36,272		$	25,268	$	—		$	456,913
Income (loss) before income taxes (1)(2)		97,966		(2,759	)		(2,571	)		1,532		(2,152	)		92,016
Total assets (3)		740,334		106,754			331,016			61,356		1,602,820			2,842,280

(1)	Included in Corporate and Other are: contingent consideration adjustments, severance charges, interest income, interest expense, net foreign exchange gains (losses), and acquisitions related charges.

(2)	Included in the income (loss) before income taxes for each of the segments are charges and credits related to restructuring and other and inventory charges.

(3)	Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

Included in the Semiconductor Test segment are charges and credits in the following line items in the statements of operations:


	For the Three Months Ended
	April 1, 2018		April 2, 2017
	(in thousands)
Restructuring and other—employee severance	$	3,761	$	(265	)
Cost of revenues—inventory charge		2,166		1,319

Included in the System Test segment are charges in the following line item in the statements of operations:


	For the Three Months Ended
	April 1, 2018		April 2, 2017
	(in thousands)
Cost of revenues—inventory charge	$	320	$	885

Included in the Industrial Automation segment are charges in the following line item in the statements of operations:


	For the Three Months Ended
	April 1, 2018		April 2, 2017
	(in thousands)
Cost of revenues—inventory charge	$	200	$	—
Restructuring and other—employee severance		120		624

Included in the Wireless Test segment are charges in the following line items in the statements of operations:


	For the Three Months Ended
	April 1, 2018		April 2, 2017
	(in thousands)
Cost of revenues—inventory charge	$	836	$	522
Restructuring and other—employee severance		—		1,313

Included in Corporate and Other are charges and credits in the following line items in the statements of operations:


	For the Three Months Ended
	April 1, 2018			April 2, 2017
	(in thousands)
Restructuring and other—Universal Robots contingent consideration adjustment	$	(4,968	)	$	634
Restructuring and other—acquisition related expense		774			—
Restructuring and other—employee severance		—			205