Focuses on the proposed changes by the Pension Benefit Guaranty Corp. (PBGC) to notice penalties for underfunded pension plan participants in the U.S. Information on the requirement of the Employee Retirement Income Security Act of 1974 (ERISA) section 4011 concerning underfunding notices; Penalty that the PBGC may assess under the ERISA section 4071; Factors considered by the PBGC in decreasing the penalty.