Service design is a design method (an approach) in order to become customer centric. It’s used to improve the relationship between the organisation and their customers but also to improve the relation within the organisation.
Daniel Ewerman @ service design network
I am still trying to define service design, there will be more, there will be iterations. This definition is a good start, but the part about ‘customer centric’ is not really how I think about it. What it is, I hope to define soon.