The study developed a quantitative evaluation model of environmental performance, using a hybrid multi-criteria decision making
(MCDM) approach by key environmental indicators based on the ISO14031 environmental performance evaluation (EPE)
dimensions. The causal relationships and influence intensity among the EPE dimensions were explored to construct the network
evaluation structure. Three well-known thin film transistor-liquid crystal display (TFT-LCD) panel manufacturers in Taiwan were
used as an illustrative example. The top three key environmental indicators were found to be factory sewage discharge, Greenhouse
gas (GHG) emissions, and the ratio of green product designs in reducing CO2. The model could be further adapted to other
industries.