Use this method if your service is hard to visualise, or you want to inject some laughs and life into your team.
Use lego to map out a user journey, with different colours representing different stages of the process, and different heights suggesting the parts that have the most build up in cost or resource. Then, without thinking about the technology involved, break the thing up and remake it in the simplest way possible. How can you make that process work?
If lego isn’t your thing, you can also use plasticine, blu-tac or even your team itself to model your service.
Get creative with your bad self.