The previous Guardian search on the mobile app was a “tag” search with the ability to add results to the homepage. Although a powerful feature it was not very useful – the content appeared in alphabetical rather than relevant order and articles were not available at all.
At the Guardian we prioritise features we believe will be of most value to our readers by making data based decisions. However there was not a lot of data backing Search being a problem (after all it wasn’t very good, so users were not coming back). So we decided to tackle the issue, in one day. The majority of the recent release was out of a design sprint that I facilitated, where a developer and I sat together and worked out the best UX possible.