The curation process is split into three disciplines; the curator in charge of bringing the content together, a technical curator in charge of adding the appropriate metadata, and a marketing assistant who issues out subject matter briefs that are taken into account, e.g. one area of responsibility was Sir David Attenborough.
It’s a 24-programme collection split across many series and brands. The composition of the collection is assessed, based on the relevance of the content, based on external BBC factors in popular culture and cross-service promotion.
The content is also evaluated to see if the cover imagery is sufficiently varied, that no duplicates are used, and the imagery is not visually similar.