At the request of Financial Accounting Standards Board (FASB), the American Institute of Certified Public Accountants (AICPA) issued SOP 94-4-1. This document defines the rules under which book value accounting may be used for the investment contracts issued to non-governmental defined contribution plans. This guidance was reaffirmed in FASB Staff Position (FSP) AAG INV-1 for the use of book value accounting for investment contracts in 2004.