If you’ve heard of DoDIN APL, you probably have a list of questions. DoDIN APL (which stands for The Department of Defense Information Network Approved Products List) is a directory of IT security products that have completed both Information Assurance (IA) and Interoperability (IO) testing and certification. Attaining inclusion in the APL can be an avenue to new revenue opportunities, but like anything involving federal approval, it’s not an easy road.