This recording provides an overview (38 minutes) of the Outer OAIS-Inner OAIS (OO-IO) Model by Eld Zierau. The OO-IO model uses the Open Archival Information System (OAIS) Reference Model to provide a more detailed explanation of distributed digital preservation. Eld ZIerau, a digital preservation specialist at the Royal Danish Library, envisioned and specified the OO-IO model. Nancy McGovern, Director of Digital Preservation at MIT Libraries, collaborated on and contributed to the OO-IO model.