This method is generally applied to several brainstorming sessions simultaneously, each person interested in the conference can participate in this conference, everyone can focus on topics of interest, and to switch between the different groups.
A tree diagram is drawn that shows different features (needs, functions or elements of a service). For each of the branches it captures different ideas to achieve that. Different concepts can be created in combining each one of the idea branches of all the feature branches. In Service Design this helps to create combinations that can incorporate more than one feature.
After an idea or a concept has been developed it can be discussed with either experts or clients. This helps to gain additional understanding and to develop the idea further. This interview can be based on a very simple idea statement or as well on an elaborate prototype or mock-up.
Create a scene and then play a certain role, you can use or not to use props, intuitive reaction concerns the physical setting conditions. This approach helps to quickly generate and test many of the concepts and behaviors related to the scene.