The ‘distributed national collection’ is a scheme whereby the British Library envisages completing agreements with other libraries to facilitate the development of specialized subject-based research collections in order to make the most of total national resources. The implementation in Australia of a similar scheme, the Distributed National Collection (DNC), was proposed during the late 1980s and 1990s, with the National Library (NLA) as a main advocate, and a great deal of enthusiasm was generated. The use of Conspectus was envisaged, and a DNC Office was set up at the NLA. It failed for various reasons: Conspectus proved unusable, the NLA had to cut back its own acquisitions, and financial restraints forced other libraries to look after their own interests. In the UK, the initiative for collaborative collection development has been driven by the British Library and the Higher Education Funding Councils. The UK has some features which give it a better chance of success - for instance, the responsible office should be independent of all the main players, whereas in Australia this responsibility could be carried only by the National Library; the UK has a more established network of research libraries, including a number outside the higher education/national library nexus; and the existence of BLDSC is highly beneficial. However, key challenges lie ahead, notably the complexities of managing the scheme, the time needed to put it into operation, the commitment demanded from participants (notably some sacrifice of local interests required for ‘deep resource sharing’), and obtaining the initial acceptance needed from users.