This excerpt taken from the AAPL 10-Q filed May 4, 2005.
Other Terms. The Administrator, subject to the provisions of the Plan, shall have complete discretion to determine the terms and conditions of Performance Shares granted under the Plan. Performance Share grants shall be subject to the terms, conditions, and restrictions determined by the Administrator at the time the stock is awarded, which may include such performance-based milestones as are determined appropriate by the Administrator. The Administrator may require the recipient to sign a Performance Shares Award Agreement as a condition of the award. Any certificates
representing the Shares of stock awarded shall bear such legends as shall be determined by the Administrator.