In 2015, after an extensive review process, the University of Houston (UH) Libraries chose the open source systems Hyku (then known as the Hydra-in-a-Box project), Archivematica, and ArchivesSpace to form the Libraries' digital collections access and preservation ecosystem (Wu et al., 2016) . This suite of systems, along with locally developed tools, form the Bayou City Digital Asset Management System (BCDAMS). In 2016, the BCDAMS Implementation Team began work on a multi-phase process to roll

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... ut the new systems to replace the current digital collections management system, CONTENTdm. Phase I of this process included developing fundamental models and principles as well as much of the local infrastructure and workflows (Weidner et al., 2017) . Phase II of the project will involve migrating existing digital collection metadata and files to the new digital asset management system (DAMS). This poster summarizes work done during Phase I of the project to prepare for the migration work in Phase II. This included working collaboratively to develop a Metadata Application Profile (MAP) and crosswalk for the Hyku digital collections access system, and an analysis of metadata remediation required to prepare for migration. It addresses work underway at many institutions exploring or actively migrating to a new DAMS. This poster shares the UH Libraries unique experience in preparing for the migration of UH Digital Library (UHDL) data from CONTENTdm to a new system and offers some general considerations for migrations. To develop the MAP and crosswalk from CONTENTdm, the Descriptive Metadata Working Group (DMWG) was formed. This interdepartmental team represented the Metadata and Digitization Services Department and Special Collections. Led by the Metadata Coordinator, who is also the BCDAMS Project Manager, it included the Metadata Librarian, Metadata Unit staff members, the Coordinator of Digital Projects, the Hispanic Archivist, and the Special Collections Project Manager. It was important to have these different perspectives represented to address the metadata needs of different collections, further a shared understanding of the scope and function of the system, and gain support from stakeholders such as Special Collections curators. Foundational migration considerations that informed the group's work were the types of content in the digital library, the purpose of the DAMS, and the technical specifications of the DAMS. As part of the DAMS evaluation process and preparation for system migration, an inventory of content types in the UHDL was completed. The Metadata Unit staff reviewed all of the digital collections individually recording the types of items it contained, e.g. single-sided images, double-sided images, documents, single-part audio, etc. In its discussions, the DMWG considered the descriptive needs of these content types, as well as content types that may be included in the digital library in the future, such as born digital content. This analysis also made clear collections' varying levels of complexity. Eight collections of low or moderate complexity were selected as test collections, used to test software and workflows.