Paul Robert Lloyd on creating “design histories”:

A design history looks both forwards and backwards. New posts show the team where a service is going, while older posts tell the story of how we got to where we are now.

That’s a fancy description. The simpler answer is that a design history is a blog with a design team committed to regularly posting about their work.

Love the idea of using a simple blog to keep track of how a service has evolved and changed over time. Nothing fancy. Just good ol blogging.