Shutterfly 2008 Annual Report Download - page 33

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including, among other things, estimates regarding the length of time an employee will retain vested stock options before exercising them, the estimated volatility of our common
stock price and the number of options that will be forfeited prior to vesting. The fair value is then amortized on a straight-
line basis over the requisite service periods of the awards,
which is generally the vesting period. Changes in these estimates and assumptions can materially affect the determination of the fair value of stock-
based compensation and
consequently, the related amount recognized in our consolidated statements of operations.
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