DEMATEL is built on the basis of graph theory, enabling analyzes
and solves problems by visualization method. This structural
modeling approach adopts the form of a directed graph, a causaleffect
diagram, to present the interdependence relationships and
the values of influential effect between factors. Through analysis of
visual relationship of levels among system factors, all elements are
divided into causal group and effected group. And this can provides
researchers a better understand of the structural relationship
between system elements, and find ways to solve complicate
system problems (Gabus and Fontela, 1972, 1973; Herrera et al.,
2000; Wang and Chuu, 2004).