The first step in doing anything useful with a digital accession is to answer just that question. The next is generally “now that I know, what ‘stuff’ do I need to recover the data and how might I do that?”. With some items, it’s easy enough. With others it can be rather more challenging. Alex Eveleigh just pointed me at Mediapedia – a database being developed at The National Library of Australia to help folk identify media. Best of all, it sounds like it’s been designed to help people find things by easily determined characteristics (e.g. physical measurements) rather than relying on the user to know, more or less, what they are looking for. Super idea.