The OCLC Research Library Partnership Web Archiving Metadata Working Group was established to meet a widely recognized need for best practices for descriptive metadata for archived websites. The Working Group recognizes that development of successful best practices intended to ensure discoverability requires an understanding of user needs and behavior. We have therefore conducted an extensive literature review to build our knowledge and will issue a white paper summarizing what we have learned. We are also studying existing and emerging approaches to descriptive metadata in this realm and will publish a second report recommending best practices. We will seek broad community input prior to publication.