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During disasters,information sharing across group boundary is seen as highly significant.It requires extensive information sharing flow between different groups and individuals in the community as well as among the different response teams.People who receive and share information during a disaster are also known as knowledge brokers(KBs).The importance of information sharing across group boundary during a disaster has been discussed in both academic and practitioner circles.However,they focus heavily on the organisation level or the information system perspectives.Very little attention has been paid to the individual level.This study explored the nature of cross-group boundary information sharing by knowledge brokers during a disaster particularly New Zealand.The objective of this study is to identify how KBs assess and decide the reliability of the information they receive and to whom the information is relevant during a disaster.This study also argues that during the golden hour of a disaster(72 hours following a disaster),the uncertainty and stress level that the KBs went through might affect their judgment of the reliability and accuracy of the information they receive.This study used multiple case studies,in-depth face-to-face interviews,and an inductive process to generate theories about cross group boundary information sharing by KBs during disaster.Case studies were taken from past New Zealand disasters.The scenario experienced by the KBs was the level of analysis.10 different disasters involving 22 unique scenarios were analysed.It was found that a KB went through two phases in deciding on the reliability and relevancy of information they received.In both phases,KB received and shared seven types of information across four types of boundaries using five types of media.KB were also found to use different types of cognitive resources in the process.The implication of this study includes to enable tourism industries and authorities across the Southeast Asian countries(ASEAN)to learn the process and improve on their information sharing policies and practices.It could be argued that the tourism industry plays a vital role in contributing to Gross Domestic Product(GDP)for the ASEAN.For instance,the direct contribution of Travel & Tourism to GDP was USD119.7bn in 2016(4.7#of total GDP)and increase to 7.3#in 2017.The industry expected to contribute up to USD222.8bn(5.3#of total GDP)in 2027.Therefore,business organisation in disaster management area in ASEAN can use this theory as a guide to improve the current disaster management training and to transform the current disaster management systems.