To build its extensive collection and to ensure that it will be available for successive generations requires that the Library of Congress identify and acquire those formats which are suitable for large-scale acquisition and preservation for long-term access. To help with this, the Library has created and issued its Recommended Format Specifications in order to inform its own staff and external stakeholders on the physical and technical characteristics of creative works which encourage preservation and long-term access. This presentation will discuss the reasons we created the specifications as we did, the way in which they were developed and how the Library intends to use them to help in its mission to build its unparalleled collection. Just as importantly, this session will share with the audience how the Library feels it will be of use to them as well. Because of the dynamic, ever-changing nature and availability of formats, the Library plans to revisit the specifications annually. Reviewing the specifications annually will permit the Library to keep pace with developments in the creative world, so that changes to the Format Specifications, although made frequently, can be made in small increments. The Library intends that the specifications will be part of an ongoing dialogue with stakeholders from across the spectrum, from creators to distributors to libraries, in making them as accurate and useful as possible for as many of those interested parties it can. One of the key aims of this session will be to engage the audience on this point and to obtain their thoughts and feedback on two of the most crucial concerns of anyone involved with creative works, preservation and long-term access.