The results of the different regression models arepresented in Table 4. Taken together, green projectpartnership whether with primary suppliers or majorcustomers was associated with better performance inquality, delivery, flexibility and the environment as all ofthe DR2 were significant (Models 2e5, p ! 0.05).Support for Hypothesis H1, which expected a positivelink between the extent of green project partnershipswith suppliers and operational performance, was found.Specifically, the results suggest a positive and significantassociation between delivery performance and the extentof green project partnership with suppliers (Model 3,p ! 0.05). While not significant, the linkage between theextent of green project partnership with primarysuppliers and all other performance indicators weredirectionally consistent with Hypothesis H1.Stronger support for Hypothesis H2 was found.Particularly, the relations between the extent of greenproject partnerships with major customers and quality(Model 2, p ! 0.05), flexibility (Model 4, p ! 0.10), andenvironment (Model 5, p ! 0.10) were all significant.The coefficient linking cost performance and greenproject partnership was directionally consistent but notsignificant.Some results from the contextual variables arenoteworthy. First, plant size was associated with poorerdelivery (Model 3, p ! 0.10) and environment perfor-mance (Model 5, p ! 0.10). The first result reflects thatnegative link of larger, more complex, organizationswith delivery speed and reliability and is consistent withother results in the literature [55]. The second result isconsistent with the findings of Grant et al. [46] whofound that there was a positive relation between theplant size and the pollution rate in the United Stateschemical industry.