Stock-Based Compensation (Tables)

9 Months Ended

Oct. 04, 2015

Schedule of Estimated Fair Value 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
	October 4, 2015			September 28, 2014
Risk-free interest rate		0.77	%		0.75	%
Teradyne volatility-historical		28.2	%		36.1	%
Philadelphia Semiconductor Index volatility-historical		19.7	%		24.6	%
Dividend yield		1.33	%		1.25	%

Stock Options

Fair Value of Stock Options Using 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
	October 4, 2015			September 28, 2014
Expected life (years)		4.0			4.0
Risk-free interest rate		1.1	%		1.2	%
Volatility-historical		33.4	%		38.8	%
Dividend yield		1.33	%		1.25	%