## 5 Conclusions  
The literature review analysis allowed for identifying a research gap, which is the non-existence of a reliability assessment method that would also take into consideration the quality and timeliness of the message transferred to the recipient. When defining the concept of information, the authors refer the interpretation of data to the sender and the recipient and demonstrate that by sharing information, uncertainty is reduced, and the bullwhip effect is partially excluded. However, information becomes significant only when it is understandable, interpretable and useful for the recipient. The exchange of information between users of complex engineering systems forces the physical flow of materials and the performance of activities within the framework of the ongoing process; therefore, both these flows should be considered concurrently. In their papers, the authors adopted various models of information sharing, often without referring to the data completeness and the timeliness of delivering these messages. In some papers, however, the issue of overloading is discussed, which refers to too much data transferred per unit of time. The papers ignore the impact of incomplete information on the process execution or performance of tasks. The aim of the article was to create a method for assessing the reliability of the logistics process in terms of information flow unreliability. The proposed method assumes performing five steps. The mainstream of research work was based on the issue of process reliability, in which the crucial role is played by the timely execution of operations in the process under analysis. A definition of process reliability was formulated, where three states are listed: the state of fitness, the state of partial fitness and the state of unfitness. The notion of the cargo handling process for which the verification of the proposed method was performed was also defined. The cargo handling process is a process that is commenced with the shipment of the order from the customer and is concluded when the cargo is delivered to the customer. As part of this process, sub-processes and activities were distinguished, as well as the relationships between these being part of the operation of the cargo handling process. Each activity consists of a message (data set) and an operation (set of activities). Based on operations and messages characterized in such a manner, it was possible to determine reliability. As the calculations showed, the reliability of the process based solely on technical issues gave a much greater value than the case taking into account the flow of information. As a result, it gives an insight into the importance of the issue of ignoring information in decision-making and logistics processes. It also allows for reflection on the importance of information and its failure as a cause of process failure. The goal was achieved by:  
* Characterizing the examined logistics process;
* Determining the components of the process, including the information transferred within a complex engineering system;
* Formulating a definition of process reliability;
* Developing a method for assessing the reliability of a logistics process;
* Verifying a method for assessing the reliability of a logistics process using the sample cargo handling process;
* Performing analysis and evaluation of the results obtained;
* Formulation of summaries and conclusions.