This research reports on application of the RLG/NARA August 2005 draft of An Audit Checklist for the Certification of Trusted Digital Repositories (TDR). Reasons for use and non-use were explored along with specific application. Overall, participants' perceived the TDR as a valuable framework for IR planning and high-level decision making but few used it. This study also investigated participants' perceptions of other IR planning documentation. Fifty-nine unique resources were identified as “valuable,” with the TDR as one of the three most cited resources.