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the RSP is finally linked to entities such as "Light source," "Curtain," and "Window." A view model
in the prototype is represented by the graph structure consisting of the following elements.
(1) RSP nodes
An RSP is represented by a hexagon node. The color of the node expresses whether it is value or cost.
Since "Light" RSP in Figure 3 is a value for the customer, the node is painted blue.
(2) FN nodes
An FN (e.g. "Provide natural light") is represented by a square and white node.
(3) FP nodes
An FP which influences the RSP directly (i.e. CoP, e.g. "Natural light") is represented by an orange
square node, while an FP which influences an RSP indirectly through CoPs (i.e. through ChP such as
"Strength of the natural light") is represented by a yellow square node.

(4) Arcs between FN nodes
A relationship between functions is represented by an arc between FN nodes. For example, the arc
between "Provide light" node and "Provide artificial light" node means that one is developed into the
other in Figure 3.
(5) Arcs between FN nodes and FP nodes
An FI is represented by an arc between an FN node and an FP node. For example, the arc between
"Provide natural light" node and "Natural light" node means "Provide" FT in Figure 3.

(6) Arcs between FP nodes
A relationship between FPs is represented by an arc between FP nodes. This relationship is generally
defined as a result of the relationship between functions or the effect of the embodiment structure. The
designer can set a causal relation on the relationship expressed by a directed arc. For example, the arc
between "Strength of the artificial light" node and "Strength of the light from the light source" node
means that one affects the other in Figure 3.

References

Krasner G. E. and Pope S. T. (1988). For Using the Model-view-controller User Interface
Paradigm in Smalltalk-80. Journal of Object-Oriented Programing 1:3, 26-49.

Shimomura Y. and Tomiyama T. (2002). Service Modeling for Service Engineering. Proceedings
of The 5th International Conference on Design of Information Infrastructure Systems for
Manufacturing 2002,309-316.

Shimomura Y., Watanabe K., Arai T., Sakao T. and Tomiyama T. (2003). A Proposal for Service
Modeling. Proceeding of the Third International Symposium on Environmentally Conscious
Design and Inverse Manufacturing (Eco Design 2003), 75-80.

Shostack G.L. (1981). How to Design a Service, in Donnelly, J.H. and W.R. George (eds.),
American Marketing Association, 221-229.

Tomiyama T. (2001). Service Engineering to Intensify Service Contents in Product Life Cycles.
Proceedings of the Second International Symposium on Environmentally Conscious Design and
Inverse Manufacturing (EcoDesign 2001), 613-618.