This document is about a performance audit of the Thrift Savings Plan (TSP) investment management operations related to the Fixed Income Index Investment Fund (F Fund), Common Stock Index Investment Fund (C Fund), Small Capitalization Stock Index Investment Fund (S Fund), and International Stock Index Investment Fund (I Fund). The audit was conducted by the U.S. Department of Labor's Employee Benefits Security Administration and covers the period from January 1, 2012 through December 31, 2012. The audit objectives were to determine whether the investment manager implemented procedures to properly deposit, report, and manage TSP investments, and to test compliance with applicable laws and regulations.