57 Association of Research Libraries Research Library Issues 296 — 2018 • Digital preservation all activities organizations or individuals engage in over time to ensure long-term readability/usefulness of specified digital content. These two specialties work in partnership and one person may be responsible for both, but the real-time activities of digital archives and the over-time activities of digital preservation have specific tools, techniques, requirements, and practice that we need to address. You might say that digital preservation picks up where digital archives leaves off, and there would be no need for digital preservation if not for digital archives. Depending on how the scope of digital archives is defined—specific to the management of archival content or generically referring to the management of digital content—digital preservation may have a broader mandate than digital archives, being responsible in many case for the preservation of digital content of all kinds. One way to better understanding the similarities and distinctions between digital archives and preservation is to compare them side by side, the purpose of the Digital Archives and Preservation (DAP) Stack illustrated in Figure 1 below.4 Why “stack”? Because it is very common for organizations to take a technology-first or technology-only approach to digital practice. IT discussions often refer to the combination of technologies in use in their organization as their stack. Digital preservation includes as a foundational component infrastructure of the kind that the IT stack in part represents. The DAP Stack provides the organizational perspective to pair with the technological perspective of the IT Stack. There are six layers of good practice in the DAP Stack: governance, collection scope, acquisition, workflows, life cycle storage, and monitoring, with characteristics that distinguish real-time (digital archives) and over-time (digital preservation) planning and action. For radical collaboration, these are core concepts that need to be explored before building partnerships that are able to leverage the cumulative strengths of these partnered domains.