Strong trading partner relationships have been consistently cited as critical to successful supply chain collaboration Derocher and Kilpatrick 2000; Mentzer et al. 2001). Strong relationships increase the likelihood that firms will exchange critical information and work together to plan and implement new supply chain strategies, sharing the risks and rewards along the way (Derocher and Kilpatrick 2000;Mentzer, Foggin, and Golicic 2000). Hewett, Money, and Sharma (2002) found that relationship quality between buyers and sellers, as measured by levels of trust and commitment, was significantly related to repurchase intention.In spite of the compelling arguments about the importance of strong relationships, interviews and informal conversations with logistics executives at manufacturing firms suggest that their customers continue to engage in questionable business practices that threaten to erode the levels of trust and commitment in their relationships. These questionable practices range from sending back out-ofdate merchandise and refusing to pay for it to charging penalty deductions for late deliveries, even when the customer causes the delay. If the occurrence of these questionable practices were common, it would provide a major barrier for firms trying to implement collaborative supply chain strategies.Trading partners in most supply chains are involved in a plethora of interactions, which include information transmission, dealing with damaged merchandise, unloading trailers, and negotiating and agreeing on price changes. The opportunity to act in a less-than-ethical manner always exists in these interactions and, unfortunately, not every interaction has a positive spin to it. In this research, such actions on the part of one trading partner is referred to as "questionable" if it could be argued that the interaction involved some act by one of the parties that could be questioned on moral and ethical dimensions.For example, a manufacturer might, in an effort to reduce paperwork and eliminate monitoring activities, allow customers a credit of up to 2% of the invoice for damaged product without documentation. A "questionable practice" in this regard would be the customer who asked for the 2%