This document announces U.S. Customs and Border Protection’s (CBP’s) plan to modify the National Customs Automation Program (NCAP) test concerning document imaging, known as the Document Image System (DIS) test. The DIS test allows Automated Commercial Environment (ACE) participants to submit electronic images of a specific set of CBP and Partner Government Agency (PGA) forms, documents, and supporting information to CBP via a CBP-approved Electronic Data Interchange (EDI). This notice announces several changes to the DIS test. First, eligibility to participate in the test is being expanded to include anyone transmitting cargo release or entry summary information to ACE. Second, CBP has added forms to the list of forms and documents supported by the DIS test. Third, the list of eligible forms and documents will now be maintained on the CBP Web site. Fourth, all future additions and changes to the list of eligible forms and documents will be announced on the CBP Web site, rather than by Federal Register notice. Finally, the DIS test is being amended to permit participants to submit all DIS eligible forms and documents as attachments to email, in addition to the methods of transmission previously authorized. This notice provides DIS test details including commencement date for the modifications announced herein, eligibility, procedural and documentation requirements, and test development and evaluation methods.