This excerpt taken from the HSY DEF 14A filed Mar 16, 2007.
What are performance stock units and performance stock awards?
Performance stock units and performance stock awards result in a payment to a participant only if performance goals that the Committee establishes are satisfied. The initial value of each performance stock unit and each performance stock award is equal to the fair market value (on the date of grant) of a share of our Common Stock. The Committee will determine the applicable performance goals, which may be applied on a Company-wide or an individual business unit basis, as deemed appropriate in light of the participants specific responsibilities. Please refer to the discussion below about performance goals for more information. Depending upon the level of achievement of the performance goals, the number of performance stock units or performance stock shares earned at the end of the performance measurement period may be more or less than the initial value, and will be zero if the minimum performance goals are not achieved.
In addition to the performance requirements discussed above, performance stock units and performance stock are subject to additional limits set forth in the EICP. During any calendar year, no participant may receive more than 500,000 performance stock units or shares of performance stock.
We will issue a share of Common Stock or pay cash equal to the fair market value of a share of Common Stock for each performance stock unit earned (subject to required tax withholding), as determined by the Committee. We issue shares of Common Stock at the time a performance stock award is made, but the shares cannot be transferred or sold by the participant until they are earned.
See the Executive Compensation section of this proxy statement for additional information about performance stock units previously granted to our named executive officers under the Incentive Plan.