This study has several limitations. These limitations present opportunities for future research. First, several problems are associated with the use of self-reports. The common method bias may be a problem because survey data was gathered from a single respondent per firm (Podsakoff et al., 2003). Second, the sample size was insufficient for testing additional hypotheses, and the industrial type of the respondents was restricted primarily to manufacturing. Because of the difficulties
involved in collecting data from individual enterprises, help was solicited from the Korean Logistics and Distribution Association where members are mostly from the manufacturing sector. For future research, data should be collected from a more diverse sample across industries. Third, the research did not control for organization size. Because large firms typically have more available resources and well developed GSCM practices, researchers should control for organization size (Zhu and Sarkis, 2004). Finally, the existing studies suggest several other types of GSCM practices such as investment recovery, the closed-loop system, eco design, and so on. Future GSC research should include divers GSC practice dimensions.