In order to achieve GSCM efficiency, it is necessary to have an
analysis to figure out the interrelationships among the factors.
However, it is difficult to present reasons of causality among the
proposed criteria and their relationships, which have been previewed
by experts and decision makers. Concerning supplier
collaboration, Tseng et al. (2009a) and Tseng (2010) indicate that
firm and supplier collaboration is constrained by incomplete
information and subjective human preference, a phenomenon that
has rarely been thoroughly examined. Since human judgments are
usually judged subjectively and human preferences are unclear and
difficult for decision makers to describe by exact numerical values,
fuzzy logic evaluation is needed to cope with this problem (Chang
et al., 1998; Chen and Chiou, 1999; Tseng, 2010). A decision making
trial and evaluation laboratory (DEMATEL) method is conducted to
create a causal diagram of interdependent factors. This method is
advantageous in revealing the relationships among factors and
prioritizing the criteria based on the type of relationships and
severity of their effects on each other criteria. In addition, the most
advantage of hybrid fuzzy DEMATEL is to consider the condition of
the fuzziness and handle with flexibly with fuzziness situation (Wu,
2008). Based on these advantages, DEMATEL is used to determine
effect and cause criteria, and to gain the model in terms of
linguistics parameterized with triangular fuzzy numbers.