This excerpt taken from the CE DEF 14A filed Mar 26, 2007.
Pension Benefits Table
The following table shows the estimated present value of the accumulated benefit based on pay and service as of December 31, 2006 payable under three pension benefit plans, the Celanese Americas Retirement Pension Plan (CARPP), the Celanese Americas Management Supplemental Pension Plan (CAMSPP), and the Celanese AG Board Pension Plan (CABPP). For descriptions of the terms of these plans, see Compensation Discussion and Analysis Benefits.
The present value is the amount needed today that, with interest, would provide the employees future retirement benefit. Assumptions used to determine the present value of benefits under the CAMSPP and for benefits earned for employees hired prior to January 1, 2001 in the CARPP are based on a 5.875% discount rate and mortality from the 1994 Group Annuity Mortality Table. Benefits earned for employees hired on or after January 1, 2001 in the CARPP are based on an assumed future interest crediting rate of 5.00% to age 65 and an interest only discount rate of 5.875%. Retirement in the CAMSPP is assumed to occur at age 60 and at age 65 in the CARPP. Assumptions used to determine the present value of benefits under the CABPP are based on a 4.625% discount rate and mortality from the Heubeck Richttafeln mortality table.