Dubberly Design Office is a consultancy which is focused on making hardware, software, and services easier to use. One of the founders, who also co-authored this process, Hugh Dubberly worked at Apple Computer in the late 80s and early 90s, Hugh managed cross-functional design teams and later managed creative services for the entire company. The second co-author, Shelley Evenson, was previously a Research Manager in Design and User Experience at Facebook and a Principal User Experience Designer and Manager for Microsoft and one of the co-founder of the International Service Design Network. Today she is Global Design Lead Technology at FJORD.
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The first thing that struck me about this Service Design process is the inclusion of the "socialize" phase. The creators describe it as a moment where you are:

"creating the network for uptake - both within the service organization and with the customers"

I find this extremely inspiring as the addition of this moment makes sure we recognize that a service needs the involvement of multiple teams and multiple stakeholders in order to be made real. So this process is not only about being innovative and coming up with new exciting service ideas. No, it's also about making delivering those ideas in the real world.
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A second thing I particularly like, is that the process comes with a list of "Representative deliverables". This additional table explains in more detail for each phase what's the goal of the phase and what are the different tools you might use to get to the end result.
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The third thing which I found lovely in this process is how it shows the interactions between the different phases. It's not a completely linear process but rather one where you might go back a few steps if you notice that you need to go back to the drawing board. This makes the process look more complex, but it makes it again more realistic.
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I found this process in an article by Hugh Dubberly and Shelley Evenson written in 2010 called "Designing for Service: Creating an Experience Advantage" on the Dubberly Design Office website. I found the second illustration of the process in a slide deck called "Exploring Service Design: User Experience Beyond the Screen" compiled by Ariel van Spronsen