Stock-Based Compensation (Tables)

9 Months Ended

Sep. 28, 2014

Schedule of Estimated Fair Value of TSR Performance-Based Restricted Stock Unit Awards Assumptions

The fair value was estimated using the Monte Carlo simulation model with the following assumptions:

	For the Nine Months Ended
	September 28, 2014
Risk-free interest rate		0.75	%
Teradyne volatility-historical		36.1	%
Philadelphia Semiconductor Index volatility-historical		24.6	%
Dividend yield		1.25	%

Schedule of Estimated Fair Value of Stock Options Assumptions

The fair value of stock options was estimated using the Black-Scholes option-pricing model with the following assumptions:

	For the Nine Months Ended
	September 28, 2014			September 29, 2013
Expected life (years)		4.0			4.0
Risk-free interest rate		1.2	%		0.6	%
Volatility-historical		38.8	%		46.8	%
Dividend yield		1.25	%		0.0	%