This document contains temporary regulations relating to additions to the list of items of information disclosed to the Bureau of the Census for use in the Longitudinal Employer-Household Dynamics (LEHD) project and the Survey of Income and Program Participation (SIPP) project. These regulations provide guidance to IRS and Social Security Administration (SSA) personnel responsible for disclosing the information. The text of the temporary regulations also serves as the text of the proposed regulations set forth in the notice of proposed rulemaking on this subject in the Proposed Rules section of this issue of the Federal Register.