## 5 Discussion  
The coordination mechanisms identified in the research, which logistics operators can apply as a personalised combination consisting of market, social, hierarchical, and logistical coordination mechanisms, are an extension of other authors' research in both the area of network coordination and the role of the logistics operator in omni-channel systems. Many researchers point to the relationship between the development of omni-channel systems [100; 101; 102; 103] and the increasing role of logistics operators in ensuring the reliability of flows in such complex distribution systems [48]. The mechanisms identified in our study allow us to address the challenges posed by the development of omni-channel. The results presented so far by other authors have focused in particular on pointing out the importance of LSPs in integrating omni-channel operations and reducing their operating costs [104; 105; 16]. Thus, the authors point to the relationship between selected flow mechanisms and the reliability of flows in distribution systems, without discussing the role of the logistics operator in network coordination. Publications on network coordination, on the other hand, do not delve deeper into logistics coordination [63; 107; 106], which we have expanded in our research as a set of flow mechanisms. The conceptualisation of logistics coordination is an important contribution to the study of network coordination, especially in supply, distribution, procurement, and production networks. The role of the logistics operator in omni-channel network coordination, as we have shown, is not limited to logistics coordination based on flow mechanisms but points to the need to use mechanisms of various forms of coordination. We continued to identify as important mechanisms those based on price and also non-price mechanisms, including in particular formal relationships, structures, and control systems resulting from management style as well as organisational integration and above all trust. All of these factors have also been shown to be important in studies by other authors studying network coordination [61; 63]. Interestingly, on the basis of the research conducted, the mechanism with the least importance among the mechanisms of the logistics coordination form is the one related to organising transport and extraordinary transport. Transport is one of the most important functions in the supply chain, and its role is particularly important in last-mile logistics, i.e., the final stage of delivering goods to the end customer [108]. Nowadays, with the development of e-commerce and online sales, transportation in last-mile logistics has become extremely important, as this is where end-customers have direct contact with the goods and the delivery service [109]. In our opinion, this is related to the global framing of the transport issue and the lack of targeting of the question precisely under the specifics of transport in the reality of last-mile logistics. The methodology we used is not new and refers to the research of other authors. Due to its qualities, the AHP method is often used to assess multiple factors influencing the problem under investigation. Research using the AHP method has been conducted for omni-channel issues [110; 111; 112; 113; 114], logistics operator selection [115; 116; 117], and also the analysis of network coordination mechanisms [118; 119; 120]. Thus, various authors addressing the issues we have addressed have drawn on similar methodologies. Our practical contribution to this body of the literature is the development of a tool that is dedicated to participants in omni-channel distribution. We have named this tool the 'Multicriteria assessment sheet of the coordination competence of logistics operators for omni-channel systems' (Figure 15). This tool links the role of the logistics operator in such systems to the challenges posed to the logistics operation of such systems and also to the network coordination mechanisms.