Zeng et al. developed a systematic review to investigate the research advances of safety research with respect to chemical industrial parks, and a keyword co-occurrence analysis of 116 scientific articles was conducted to support the classification of research topics in this field. Chen et al. collected 132 articles related to domino effects in chemical process industry (CPI), and a thorough classification and discussion of methodologies for modeling and managing domino effects. He et al. focused on the assessment methods of Na-tech events, domino effects, and concurrent hazards in CPI, the development trends and the research gaps were identified. The triggering relationship between hazards is the core of domino and Na-tech studies .