September 8, 2010 Mr. James Gunn Technical Director International Audit and Assurance Standards Board 545 Fifth Avenue, 14th Floor New York, NY 10017 Re: Exposure Draft: Proposed International Standard on Assurance Engagements 3420, “Assurance Reports on the Process to Compile Pro Forma Financial Information Included in a Prospectus” Dear Mr. Gunn: The American Institute of Certified Public Accountants (AICPA) is pleased to comment on the International Auditing and Assurance Standards Board’s (IAASB) proposed International Standard on Assurance Engagements (ISAE) 3420, “Assurance Reports on the Process to Compile Pro Forma Financial Information Included in a Prospectus,” which deals with reasonable assurance engagements undertaken by a professional accountant in public practice to report on the process to compile pro forma financial information (PFI) included in a prospectus, where such reporting is required by securities law or the regulation of the securities exchange in the jurisdiction in which the prospectus is to be issued, or where this reporting is generally accepted practice in such jurisdiction. This letter provides our responses to the request for specific comments. 1. The AICPA’s Auditing Standards Board (ASB) does not intend to adopt or converge with this exposure draft (ED). Our current standard on reporting on PFI—Chapter 4, “Reporting on Pro Forma Financial Information,” of Statement on Standards for ...