## 2 Review of Literature
### Assessment of Information Quality  
This sub-chapter provides an overview of the literature on information flow in engineering systems. The authors in the selected papers identify and discuss issues related to information quality. In successive papers, on the other hand, the authors perform an assessment of information quality based on the chosen considerations. In this sub-chapter, the quality of information is described as per the scheme introduced in Figure 1.  
As part of this problem, it can be said that the authors of these papers base their understanding of the subject-matter on a system consisting of a human, an engineering facility, the environment and problems relating directly to the information. These issues are related to the reliability of the facility as well as security. Many papers concern the discussion of issues within the information system, i.e., for example, information barriers or unreliability of information. Table 1 presents the classification of quality issues related to data (provided information), the user (recipient or sender of information), as well as issues resulting from external factors, i.e., changes in the environment. Figure 1: Scheme for assessment of information quality. The issue of the assessment of information quality is being considered at the level of data, the user (sender or recipient of information), as well as the influence of the environment. Most often, it concerns the concept of data redundancy, incomplete messages and unreliable information. There are two similar concepts in this column, data redundancy, which is related to the fact of an overflow of information present, while overload refers to a unit of time, i.e., there is too much information per unit of time. In the case of the user, it is the recipient of information that is analyzed most often; here, various problems are distinguished, such as psychological, educational or linguistic barriers, which hamper the understanding of the transmitted message. With respect to the machine operator, the decisive factor is the operator's experience which will exclude the risk of classifying the read value as a completely different one. In the case of the environment, there are numerous factors that can disrupt the reception of information. For example, it may be the lack of access to necessary information. In the case of the issue of reliability and security, the authors point out that the provided information must be reliable and delivered on time. Problems within the information system can also result from external disturbances, such as delivery errors or a lack of necessary documents. One of the conclusions that can be drawn based on the literature review on the issue of information quality is that the proper operation of the information system has a significant impact on decision-making as well as the execution of the specified tasks. However, these papers do not describe in detail the negative effects in the event of the occurrence of problems such as information redundancy or misreading of the message. The authors approach the estimation of the information quality issue differently. However, in the available literature, multi-criteria methods are most often used to provide an assessment of the quality of information and IT systems, in which various aspects of the assessment are considered. Therefore, the table presented in Appendix B presents a summary table consisting of 16 selected papers where the quality of information was assessed utilizing various aspects. The aspects have been divided into several groupings and dimensions based on the paper itself [44]; the \"+\" sign indicates the aspects that appear in a given paper. Furthermore, the authors most often mention the aspect of accessibility of information. The largest number of authors pay attention to aspects related to the contextual dimension, i.e., in the literature, the greatest emphasis is put on the message content, whether it is complete, results in an added value, whether it is timely, etc.