the United States, Canada and the United Kingdom is developer led. Unfortunately, the large number of reports written on the thousands of sites dug each year are not necessarily published in public forums. So-called grey literature is sometimes difficult for even archaeologists outside the developer or the CRM organisation that performed the work to access. Some initiatives, notably the OASIS project of the Archaeological Data Service in the UK, are beginning to make the reports available to everyone. Heritage curation and interpretation Curation refers to the long-term preservation and retention of heritage assets and to providing access to them in a variety of forms. Fragile heritage assets may need to be preserved in a special environment, and protected from light (especially ultra-violet), humidity, fluctuations in temperature and in some cases, oxygen from the air. Large museums generally employ specialist conservators as well as education officers, archivists and researchers. Museums vary in their approach to interpretation ranging from traditional museums that display collections of artefacts behind glass, with labels identifying each item and giving provenance, to living museums which attempt to recreate a historical place or period so that people can experience it. Within a single museum, a range of approaches may be used including interpretative panels, presenting artefacts in a realistic setting as they would have been experienced, and creating interactive and virtual exhibits. Museums also have processes to loan artefacts to other institutions or exhibitions. Interpretative panels, and other signage, such as Blue plaques in the UK are important in ensuring that cultural heritage is understood in the context of the local community. Historic preservation and restoration Preservation and restoration usually refers to architectural or engineering heritage assets such as heritage buildings or other structures and Heritage railways. The UK has a number of different forms of protection for buildings and structures, including listed buildings, conservation areas and Scheduled Ancient Monuments. In France a building or other structure can be protected as a Monument historique. Successful heritage management for a building generally requires that the building continues to be used, as disused buildings are likely to deteriorate quickly. If the purpose for which the building was originally constructed is no longer viable, then other uses, often requiring sympathetic modification must be found. Heritage machinery, such as antique or vintage cars and heritage railways can best be understood and are best accessed and experienced by the public when they are