Livework is historically the first agency focused mainly on service design. 

The people behind this company want to ‘improve the way people live and work.’ They do this by ‘designing services that are better for the people who use and deliver these services.’ 

At the time of writing, Livework has three studios: one in London, one in Rotterdam and one in São Paulo.

The first thing I particularly like about this Service Design process is it's simplicity. The whole process is made just of four phases: Insight, Ideas, Prototyping and Delivery. Such a simplicity has the benefit of not overwhelming a client when you present how the collaboration will work. 

As many other Service Design processes, this one also shows pretty well the that the process is a ping-pong between convergent divergent moments (where we open things open, dream, try) and convergent moments (where we decide and reduce possibilities). Here the processes shows that in a very subtle way that feels more like a subtle wink for the connoisseur who will get reassured when seeing it, without overwhelming the person who is new in the field. 
This is something, that I think we could implement in our own Service Design processes. How can we add little Easter eggs in its visualization that are references to smart academic stuff without overwhelming the non-nerds?

I found this process in a slide deck called "Exploring Service Design: User Experience Beyond the Screen" compiled by Ariel van Spronsen. In this 51 page document you'll find many basic information about Service Design and other Service Design processes.