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A dataset held by the National Archives in its raw form might consist of the results of a survey which were processed by a computer program and then stored on a form of software, such as magnetic tape. If the dataset is deemed worthy of preservation, it is transferred to NDAD, where the data is converted or copied to a standard format to ensure its survival beyond the lifespan of the software on which it was originally stored. It is also given a reference number, beginning CRDA/nn/DS/..., by which the dataset will normally be referred.

Next, a context is produced for the data by NDAD archivists, which, in adherence to archival tradition, takes the form of a written administrative history of the dataset, and a hierarchy of catalogues of its contents. These are called Finding Aids, because as well as providing background information for interpreting the data itself, they assist the user in their navigation and retrieval of it.

The finding aids and datasets are then made available on the NDAD website, free of charge. Alternatively you can order copies of the data on physical media for a fee.