System dynamics can simultaneously reflect multi-physics, multi-scale,
multi-interaction and multi-disciplinary in the model. The units of
elements reflected in the model vary. Multi-physics includes ships,
spare parts, mechanics, age of ships, and multi-scale includes manpower,
number of ships, spare parts, mechanics, etc. If a more specific model
is built, the types are more diverse. In this chapter, the root causes
analyzed in Chapter 2 are implemented as a system dynamics model. Each
root cause model is used as a module of the integrated model. Modules
are linked according to causality.