The aim of this study is to investigate the efficiency and the determinants of efficiency of optoelectronic firms in Taiwan. Initially, the efficiency of each firms were evaluated using data envelopment analysis (DEA) approach. To investigate the determin The aim of this study is to investigate the efficiency and the determinants of efficiency of optoelectronic firms in Taiwan. Initially, the efficiency of each firms were evaluated using data envelopment analysis (DEA) approach. To investigate the determin