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BACKGROUND AND AIM: Risk communication is considered a major factor in disaster risk management by the concerned policymakers and researchers. However, the incoherence of variables affecting risk communication in various studies makes it difficult to plan for disaster risk communication. This study aims to identify and classify the influential components in disaster risk communication. MATERIALS AND METHODS: This systematic review was conducted in 2020. Databases included PubMed, Scopus, and Web of Science. In searching for articles, there was no limit on the date of publication and the language of the article. The research addressed both natural and man-made disasters. The Preferred reporting items for systematic review and meta-analysis protocols (PRISMA) checklist was followed throughout the research, and the quality of the papers was assessed using the mixed methods evaluation tool (MMAT). RESULTS: In searching the articles, 3956 documents were obtained, of which 1025 duplicated articles were excluded. The titles and abstracts of the remaining documents (2931) were examined, of which 2822 were deleted, and the full text of 109 documents was studied for further assessment. Finally, after applying the inclusion and exclusion criteria and reviewing the full texts, 32 documents were considered to extract the data and for quality assessment. On studying the full text of the obtained documents, 115 components were found, which were classified into five groups (message, message sender, message receiver, message environment, message process) and 13 subgroups. In addition, the obtained components were classified as those proposed by the authors of the article and those obtained from disaster risk communication models. CONCLUSION: Identifying the effective components in the disaster risk communication gives a more comprehensive view of risk communication to the disaster managers and executives and provides the decision-makers with an important platform to be able to use the components of risk communication and increase the impact of messages and ultimately increase people's preparedness for disasters in planning operations for the risk communication.

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This article is a Letter to the Editor and does not include an Abstract.

Background: The frequency and severity of disaster occurrence and emergency situation, and the importance of disaster risk communication of relief organizations to increase the readiness of societies in the case of disaster is increasing around the world. This study aimed to identify relief organizations' strategies to improve disaster risk communication in Iran. Methods: This qualitative study was conducted with the participation of 25 managers, relief workers, and people who had experiences in response to one of the disasters. The data were collected using semi-structured interviews and analyzed using conventional content analysis.Results: The analysis of the data of this study led to the identification of 3 categories and 9 sub-categories regarding strategies of relief organizations to improve risk communication. These categories are 1) management of information and training communication (facilitation of training processes, diverse training strategies, and integrated informing), 2) management of communication barriers (trust building, managing people's demands and efforts to respect affected people), and 3) Inter-organizational communication management (coordination to meet people's demands, improve communication coordination and strengthen communication platforms)Conclusion: Relief organizations use different strategies to improve disaster risk communication, and communication barrier management is vital for improving organizations' communication with people. Developing risk communication improvement strategies can help planners and managers design and implement effective risk management programs.