How Spotify build a product

I've been thinking about website design for a while now, especially in relation to our new University of Bristol Careers Service site (which thankfully will be up and running soon). I bought in some usability expertise from Stuart Church, and a while ago he shared with me a rather grainy photo of a slide, presumably taken from the back of a room at a talk something to do with web usablity. Unfortunatley I couldn't find the orginal source but it was so useful I re-drew it (apologies to the originator). So here it is, just in case it's of use to anyone else (and the title of the slide in question was 'How Spotify build a product')

Not like this...

Like this!

The Government Digital Service desing prinsiples are also really useful - gov.uk/design-principles