Figure 1 shows the prefab supply chain. In this figure, we can
see that there are three departments get involved, the prefab
factory, logistics provider and the finial construction site. The
prefab factory shoulders the responsibility to produce prefabs
according to the on-site schedule and delivers the finished
prefab to the construction site. In practice, in order to focus
on its core competencies (Cheong, 2004), the prefab factory
always outsources its logistics function to a third-party
logistics (3PL). A 3PL company provides shipping and
warehousing services. And the finial construction site
assembles prefabs by crane tower. The dashed line in figure 1
shows material flow, while the dotted line represents the
information flow