This excerpt taken from the PBR 6-K filed Sep 10, 2009.
b.2) Variable contribution plan
A portion of this plan with defined benefits characteristics refers to the risk coverage for disability and death, a guarantee of a minimum benefit and a lifetime income, and the related actuarial commitments are recorded according to the projected credit unit method. The portion of the plan with defined contribution characteristics, earmarked for forming a reserve for programmed retirement, was recognized in the results for the year as the contributions are made. In the six-month period ended June 30, 2009, the contribution of Petrobras and subsidiaries to the defined contribution portion of this plan was US$44.
Petrobras an the other sponsors fully assumed the contributions corresponding to the period in which the participants had no plan. This past service shall consider the period as from August 2002, or from the date of hiring, until August 29, 2007. The plan will continue to admit new subscribers after this date but no longer including any payment for the period relating to past service.
14. Employees Postretirement Benefits and Other Benefits (Continued)
b) Funded status of the plans (Continued)
b.2) Variable contribution plan (Continued)
The disbursements related to the cost of past service will be made on a monthly basis over the same number of months during which the participant had no plan and, therefore, should cover the part related to the participants and the sponsors.