During a public emergency, which possibly evolves into a major public crisis, it is critical to quickly identify the main risk factors and assess the levels of risk, in order to efficiently manage the risks. In this study, about 40 000 emergencies in China over the past decade are investigated. Then, the five different types of risk factors are identified of these emergencies using the 5W1H methodology, including risk time (When), risk location (Where), risk population (Who), risk psychology (Why) and risk element (What), which lead to a risk matrix that is suitable for China’s national conditions. Based on this risk matrix, combined with expert knowledge, the Borda count and the analytic hierarchy process analysis, risk levels can be precisely assessed, solving ‘how to provide a solution’ (How), which provides decision-making guidance and facilitates prompt risk responses.
With the substantial influence and infiltration of the Internet, the online conflicts arising after major public emergencies are becoming increasingly intensified. Because the occurrence of emergencies and the transmission of risks are affected by many complicated factors, one of the key issues in emergency response is to conduct, based on historical emergency data, a systematic analysis and investigation on the risk levels of historical emergencies and to acquire trend patterns in data and text information, thus identifying various risk factors of emergencies. In this study, various risk factors are identified based on 44 274 public emergencies in China over the past decade, which form a ‘risk matrix’ suitable for specific national conditions, providing a foundation for further risk level assessment.
The 5W1H (what, when, where, who, why and how) analysis, also called the six Ws, is a complete methodology of problem solving, which was originally proposed by the American political scientist Lasswell in 1932. Through continuous use and improvement in later years, the 5WIH method was developed. The application of the 5W1H methodology to the study of scientific problems, that is, analysing from the six aspects of reason (Why), object (What), location (Where), time (When), person (Who) and method (How), enables researchers to think systematically and scientifically. The 5WIH method should be divided into two levels: ‘5W’ is the first level, corresponding to the fore-analysis, and ‘1H’ is the second level, corresponding to the back-end solutions. In the field of research on risk, the 5W1H methodology has been applied in the risk management of ancient buildings and metadata structure, and metadata is proposed for the risk management of architectural heritage using the 5W1H model in a context-aware application design (Lee et al.
This article aims to identify the risk of emergencies and evaluate the risk level using the 5W1H framework. Specifically, this study has two research aims. The first aim is to label and analyse various risk factors of public emergencies, including risk time (When), risk location (Where), risk population (Who), risk psychology (Why) and risk element (What), based on the contents and characteristics of the online public opinions of a particular public emergency, combined with statistical analysis, text analysis and expert opinions. The second aim is to quantitatively assess the risk level of emergencies, in order to provide decision support for future risk responses, that is solving ‘how to provide a solution (How)’, based on the already identified risk factors, an improved risk matrix, the Borda count and the analytic hierarchy process (AHP).
The occurrence of major emergencies will lead to a number of casualties and property losses, as well as negative social impacts. Therefore, research on emergencies such as earthquakes (Zhang, Weng & Huang
The first aspect is risk decision analysis of emergencies. After major emergencies took place, emergency managers or decision-makers should make correct decisions within a short time, with a view to reducing subsequent negative impacts. First, it is necessary to identify risks (Qing, Huimin & Yanling
The second aspect is risk level assessment of emergencies. Risk is the forerunner of crisis, and crisis is developed risk. A graded assessment of the risk level of emergency is a prerequisite for preventing further crises. The perspective of risk level assessment research has mainly focused on areas including the environment, the chemical industry and food safety. There are very few studies focusing on the risk level assessment of social emergencies, amongst which the research on terrorist attacks and violent mass incidents focuses on psychological trauma recovery (Gibert et al. 2015). To assess the risk level, a risk matrix is commonly used for a comprehensive assessment of risk through the probability of risk occurrence and the severity of a hazard. Because of the feasible way to express risk and the easy-to-use feature, a risk matrix is a widely applied tool for semi-quantitative risk assessment (Ni, Chen & Chen
The third aspect is the public opinion risk of emergencies. With the development of Internet technology, more and more people are accustomed to using the Internet to search for risk information (Jin, Liu & Austin
Although the overall risk level during a crisis is relatively high, prevention and control during the early stage of public communication during a crisis may avoid the risk of public opinion escalating the crisis to the greatest extent. Different from the above research on a certain type of emergencies or a certain emergency, this research is supported by a large amount of historical data. Based on historical data of 44 274 public emergencies in China over the past decade, risk factors are identified and evaluated to quantitatively label various risk factors, in order to build a risk matrix that is suitable for China’s national conditions. This matrix is then used to predict and evaluate the risk level of new incidents, from a perspective of controlling risk from the source.
Using computer-based data acquisition supplemented with manual screening, we regularly monitor several major domestic news websites in China and count the major public emergencies in various regions throughout Chinese mainland. The collected data include two dimensions: the ‘event dimension’, which refers to information about the name, type, time and place of a particular incident, and the ‘public opinion dimension’, which contains information about the online posts, person who posted, the release time, and how many people have read, commented or given ‘like’ to a particular post (
The collected data of a specific case (example).
Title | Dimension | Item | Text or data | Supporting materials |
---|---|---|---|---|
Children stabbed to death in a primary school | Event dimension | Event type | Public safety | |
Occurrence time | 06/28/2018 | |||
Occurrence location | Shanghai | |||
Number of deaths | 2 | |||
Number of injured | 2 | |||
Economic loss | - | |||
Public opinion dimension | Communication platform | Micro blog | ||
Release time | 03/06/2020 | |||
Number of forwarded messages | 9886 | |||
Number of reviews | 1805 | |||
Number of likes | 42 645 | |||
Views of netizens | - | Killing people pay for their lives; Guardians should also be punished; Mental illness is not an excuse |
List of 25 major emergencies over the past decade in China.
Time | Title | Type | Location |
---|---|---|---|
06/05/2009 | Bus arson in Chengdu | Public safety emergency | Sichuan |
06/17/2009 | Group violent incident in Shishou | Public safety emergency | Hubei |
03/23/2010 | Campus murder in Nanping | Public safety emergency | Fujian |
04/14/2010 | Yushu earthquake | Natural disaster | Tibet |
11/15/2010 | Shanghai high-rise residential fire incident | Accident calamity | Shanghai |
03/25/2011 | Henan’s ‘lean’ event | Public health emergency | Henan |
07/21/2012 | Torrential rain in Beijing | Natural disaster | Beijing |
05/03/2013 | A girl’s death at Jingwen mall in Beijing | Public safety emergency | Beijing |
06/07/2013 | Bus arson in Xiamen | Public safety emergency | Fujian |
11/22/2013 | Explosion of oil pipe line in Qingdao | Accident calamity | Shandong |
03/01/2014 | Terrorist attack at railway station of Kunming | Public safety emergency | Yunnan |
07/05/2014 | Bus arson in Hangzhou | Public safety emergency | Zhejiang |
08/02/2014 | Explosion at a chemical plant in Kunshan | Accident calamity | Zhejiang |
12/31/2014 | Stampede in Shanghai Bund | Accident calamity | Shanghai |
08/12/2015 | Explosion in Binhai New Area of Tianjin | Accident calamity | Tianjin |
03/19/2016 | The illegal vaccine in Shandong | Public health emergency | Shandong |
08/08/2017 | Jiuzhaigou earthquake in Sichuan | Natural disaster | Sichuan |
06/22/2017 | Hangzhou babysitter arson | Public safety emergency | Zhejiang |
11/22/2017 | RYB kindergarten child abuse incident | Public safety emergency | Beijing |
11/28/2017 | Tuberculosis epidemic in a middle school | Public health emergency | Hunan |
04/27/2018 | Students killed in Mizhi County, Yulin City | Public safety emergency | Shaanxi |
06/20/2018 | Girl jumped off building in Qingyang City | Public safety emergency | Gansu |
06/28/2018 | Children stabbed to death in a primary school | Public safety emergency | Shanghai |
10/28/2018 | Chongqing bus crashed into a river | Accident calamity | Chongqing |
07/15/2018 | Changchun Changsheng biological vaccine | Public health emergency | Jilin |
RYB, red yellow and blue.
To identify the risk factors of an emergent event, first the location and time of the event are identified through statistical analysis and correspondence analysis (CA) (Benzécri
Method of labelling risk factors of emergencies.
The main methods involved are as follows:
Correspondence analysis: CA is a method of data visualisation that is an exploratory multivariate technique that converts a data matrix into a particular type of graphical display in which the rows and columns are depicted as points (Greenacre & Hastie
Text mining: Text mining is a technique for extracting meaningful information from data in text form. This technique can find new information in human character based data by extracting context and meaning using natural language and document processing techniques (Bunescu & Mooney
Complex network analysis: A complex network is a network that represents high complexity, and its development is attributed to the development of applied mathematics, including graph theory and topology. A concrete complex network can be abstracted as a graph composed of a node set and an edge set. Statistical characteristic analysis of a complex network can interpret many complicated phenomena in life (Watts & Strogatz
Remark: In this study, ‘risk factors’ correspond to the ‘5W’ of the 5W1H method and ‘risk element’ just represents the ‘WHAT’ (1W) of the 5W1H method, so ‘risk factors’ contain ‘risk element’.
Based on the identified risk factors of various emergencies, combined with expert opinions, a risk matrix is constructed. However, when applying the risk matrix for risk assessment, different risk factors may appear at the same risk level, resulting in a ‘risk tie’. To address this issue, the Borda count is introduced to rank different risk factors according to their importance. Because the value of the Borda count itself is a relative value, generating a pairwise comparison based on the importance of different risk factors, a two-dimensional judgment matrix can be formed, which provides a quantitative basis for further determination of the weight of each risk factor using AHP (
Method of evaluating the risk level of emergencies.
The main methods involved are as follows:
Taking the initial cause of an emergency as the starting point and guided by the ‘5W1H’ method, we analysed the risk factors of an emergency based on its innate features and related public opinions. Then, we evaluate the impact of different risk factors on the development of the emergency, labelling the risk factors by type.
First, high-risk locations and high-risk times of emergencies are analysed based on data collection and statistics (
Statistics on the number of emergencies in various regions of Chinese mainland (2009–2018).
Statistics on the number of emergencies in each month in Chinese mainland (2009–2018).
According to the type of emergency, the ‘location–event’ two-dimensional matrix and the ‘time–event’ two-dimensional matrix are constructed. With the aid of Statistical Package for Social Sciences (SPSS) software, the corresponding analysis is carried out to identify high-risk locations and high-risk times for different types of emergencies (
‘Location–event’ correspondence analysis of emergencies.
It can be seen from
‘Time–event’ correspondence analysis of emergencies.
Emergencies are more likely to cause public concern when they involve a certain kind of risk population. The ‘risk population’ may have stigma effects or sympathetic effects. According to the statistics for different groups of people involved in emergencies in the past decade, risk populations can be grouped into the following five categories (
Different types of risk populations of emergencies.
Statistics on the frequency of the above-mentioned risk populations of event title have revealed the following facts. The ‘children of different ages’ appear the most (1454 occurrences) and draw the most concern, followed by the ‘various students’ population (876 occurrences). The majority of students are minors who are a vulnerable population that is more likely to attract attention. For example, this population includes primary school students, middle school students, schoolgirls, young girls and teenagers. Next are the ‘high-profile occupation’ population (789 occurrences) and the ‘government officials’ population (711 occurrences), primarily involving populations that are prone to conflicts between police and civilians, conflicts between the government and civilians, and conflicts between doctors and patients. For example, this population may include traffic police, urban management officials and doctors. Last is the population with a special identity (789 occurrences), referring mainly to a ‘labelled’ group of people. Examples include the elderly are extortionists by playing the role of a victim; patients are hard to deal with; migrant workers are uncultured and ill-mannered; and children of the powerful and wealthy are arrogant (
Frequency of various types of risk populations of emergencies.
During emergencies, different populations may have different interests, thus creating different risk drives, with different psychological types and psychological evolution processes. In the same emergent event, a variety of different types of risk psychology may be intertwined, causing the public opinion concerning the matter to worsen or escalate the emergency into a crisis. Through the analysis of the theory of group polarisation, the theory of the spiral of silence (Noelle-Neumann
Ten types of psychology concerning public opinion of emergencies.
Type | Interpretation |
---|---|
Unbalance | In an emergency, some netizens compare their own situation with a certain standard or a reference point and determine that they are at a disadvantage. Thus, they feel they are deprived and label themselves as a member of ‘a vulnerable group’. Unbalance psychology is caused by a sense of being deprived. |
Questioning | The questioning by netizens is mainly manifested in their ‘habitual suspicion’, ‘habitual opposition’, ‘habitual criticism’, etc. Under the influence of questioning, these netizens often start criticising and accusing officials’ behaviour without seeking the truth. |
Primary effect | Generally, it is related to ‘the importance of first impressions’ or ‘preconceived ideas’, which means that in the social activities that facilitate the formation and dissemination of public opinion, the first impression you give to the other party has an important influence on your future relationship with her or him. In an emergency, the initial information that netizens receive largely determines their basic understanding and judgment of the event. |
Profit-seeking | After an emergency, some media or individuals often deliberately hype the event just to attract other netizens’ attention, create conspicuous network traffic and make profits. |
Conformity | Conformity is a common psychosocial phenomenon referring to the fact that an individual’s attitudes and behaviours are influenced by other netizens. These people tend to follow the majority opinion. |
Onlooker | In the Internet age, the development of social media such as Weibo and WeChat has facilitated the participation of general netizens in the evolution of public opinion. These netizens do not publish comments with personal emotions regarding the event. They merely forward or like it, being a bystander following the onlooker psychology. |
Resentment | Resentment is a negative social psychology. Currently, it is mainly manifested as resenting officials, the powerful and the wealthy. The resentment of officials reflects civilians’ distrust of government officials. Resentment of the powerful reflects the general public’s misinterpretation and misunderstanding of rights and privileges. Resentment of the rich reflects a negative reaction to the gap between the rich and the poor. |
Venting | When people accumulate negative emotions or negative energy in their daily life and work, they often use network information about an emergency as a way of venting in order to obtain an emotional release. |
Anxiety | Anxiety is a complex emotional state in which feelings of anxiety, restlessness, care and depression are intertwined toward something that is closely related to themselves and that is about to happen. |
Curiosity | Curiosity is human nature. People tend to show curiosity in regard to things that are new and interesting. After an emergency, random browsing, searching for the truth and discussion of the event on the Internet are a manifestation of curiosity. |
We select typical cases of major emergencies that have occurred over the past decade and analyse the corresponding psychological types based on the comments of people. Then, we apply the social network analysis to draw a network diagram of the relationship between emergencies and psychology (
Network of psychological characteristics of emergencies.
Combined with specific cases, there are three findings. First, when a particular incident involves governmental departments or public servants, the public often questions the incident and has psychological imbalance towards the investigation of the incident. The public habitually suspect government behaviours and always label the public as a ‘vulnerable group’ under the influence of their psychological imbalance. Second, in general, for major natural disasters or traffic accidents, the majority of the public manifests conformity and onlooker psychology. For example, in a major traffic accident, the public generally expresses mourning and regret for casualties caused by the accident. Third, the majority of the public manifests anxiety in emergencies related to the safety of their own lives. For example, for the ‘vaccine scandal’ and for ‘being murdered on a car ride booked online’, the public shows concern about their own safety.
When risk elements (or sensitive words) are involved during the dissemination of public opinion, civilians’ feelings are affected, their attentions drawn, and complaints and negative emotions generated. For example, the vaccine scandal event in March 2016 was published in
Through the text analysis of the communication content of public opinion regarding major emergencies in recent years, combined with expert knowledge, the risk elements that can easily cause the outbreak of public opinion are identified and shown in
Risk elements for public opinion transmission in emergencies.
Based on the various types of risk factors identified from the historical emergencies, we first determine the degree of influence and probability of occurrence of different risk factors and construct a risk matrix to evaluate the level of risk factors. Then, we use the Borda count to sort and evaluate the importance of various risk factors, obtaining the sorting results of the importance of various risk factors. Finally, according to quantitative ranking results based on risk factor importance, we establish an AHP judgment matrix, determine the weight of each risk factor and ultimately obtain the comprehensive risk level.
In the case of different risk levels and risk occurrence probability, the resulting risk matrix is different. In this article, the influence of different risk factors is divided into five levels, and the risk occurrence probability is also divided into five levels, forming a 5 × 5 risk matrix. Specifically, the five risk influence levels are ‘limited’, ‘slight’, ‘moderate’, ‘serious’ and ‘crucial’. The risk influence is divided into five levels mainly based on the occurrence frequency of different risk factors in the 40 000 emergencies over the past decade in China. For example, the highest frequency words are ‘Die’, ‘Death’ and ‘Kill’ about risk element, so these words belong to the ‘crucial’ level. The five levels of risk occurrence probability are ‘highly unlikely (0% – 10%)’, ‘unlikely (11% – 40%)’, ‘likely (41% – 60%)’, ‘very likely (61% – 90%)’ and ‘extremely likely (91% – 100%)’. Thus, a risk matrix for emergencies is created (
Risk matrix of emergencies.
Degree of influence ( |
Risk factor ( |
Probability of occurrence ( |
||||||||
---|---|---|---|---|---|---|---|---|---|---|
Risk time | Risk location | Risk population | Risk psychology | Risk element | Highly unlikely | Unlikely | Likely | Very likely | Extremely likely | |
Limited | Non-high incidence period and sensitive period | Non- high incidence area | Not involving a common risk population | Not involving a common risk psychology | Not involving a common risk element | Low | Low | Relatively low | Relatively low | Medium |
Slight | Other high-incidence period | Other high-incidence area | Ordinary public officer and civil servant | Onlooker, conformity, curiosity | Fraud, extortion, rumour, epidemic, etc. | Low | Relatively low | Relatively low | Medium | Relatively high |
Moderate | High-incidence period June–August | Beijing, Shanghai, Tianjin, etc. | Teacher, student, child, etc. | Primary effect, imbalance, profit-seeking | Kidnapping, terrorist attack, self-immolation, etc. | Relatively low | Relatively low | medium | Relatively high | Relatively high |
Serious | During major holiday and festival | Sichuan, Zhejiang, Yunnan, etc. | Urban management officer, doctor, migrant worker, etc. | Anxiety, venting | Cult, hacking, sexual harassment, lewdness, etc. | Relatively low | Medium | Relatively high | Relatively high | High |
Crucial | During the same period when major historical events occur | Guangdong, Xinjiang, Tibet, etc. | officer, traffic police, girl, etc. | Resentment, questioning | Death, killing, explosion, shooting, etc. | Medium | Relatively high | Relatively high | High | High |
To further illustrate the risk level assessment process, we selected a typical case to show details of the analysis. On 28 June 2018, near a primary school in Shanghai, an unemployed man enacted ‘revenge on society’ by slashing three boys and one female parent. Two of the three injured boys died. Based on the ‘risk matrix of emergencies’ (
Risk factor assessment results regarding ‘Shanghai slashing of primary school students’.
Risk factor ( |
Degree of influence ( |
Probability of occurrence ( |
Risk factor level ( |
Risk factor level quantised value ( |
---|---|---|---|---|
Risk time: June | Moderate | 11% – 40% | Relatively low | 0.3 |
Risk location: Shanghai | Moderate | 41% – 60% | Medium | 0.5 |
Risk population: Students | Moderate | 61% – 90% | Relatively high | 0.7 |
Risk psychology: Venting | Serious | 61% – 90% | Relatively high | 0.7 |
Risk factor: Slashing | Crucial | 61% – 90% | High | 0.9 |
For risk factors regarding the ‘Shanghai slashing of primary school students’ incident, both the ‘risk population’ and ‘risk psychology’ are ‘relatively high’, resulting in a ‘risk tie’, which means that the same risk level occurs for different risk factors. In this case, the Borda count is used to quantitatively rank the relative effect of the above five risk factors on the overall risk. The Borda count formula is as follows:
The above Borda count is used to evaluate the importance of each risk factor of a specific case. The results are shown in
Ranking of the importance of each risk factor in the ‘Shanghai slashing of primary school students’ incident (Borda value).
Risk factor ( |
Degree of influence ( |
Probability of occurrence ( |
Borda value ( |
Borda ordinal value ( |
||
---|---|---|---|---|---|---|
Risk time | Moderate | 11% – 40% | 2 | 4 | 4 | 4 |
Risk location | Moderate | 41% – 60% | 2 | 3 | 5 | 3 |
Risk population | Moderate | 61% – 90% | 2 | 0 | 8 | 2 |
Risk psychology | Serious | 61% – 90% | 1 | 0 | 9 | 1 |
Risk element | Crucial | 61% – 90% | 0 | 0 | 10 | 0 |
According to the Borda count (
As the Borda value itself is a relative value, it is easy to compare the importance of different risk factors amongst pairs and construct a two-dimensional judgement matrix (
Using the above judgment matrix, the weight of each risk factor can be obtained as follows:
After the consistency verification, the consistency checking result of the judgment matrix is CR = 0.0265 < 0.1, indicating that the consistency test is met and that the calculation result of the influence weight of each of the above risk factors is valid.
Based on the influence weight of the above risk factors and combined with the quantised value of the risk level of each risk factor, the comprehensive risk level of the specific emergency can be obtained:
In the specific case mentioned above, the degree of influence (
Based on the same method and procedure, the comprehensive risk level of some emergencies with the same type of the specific case was calculated. The selected cases are as follows: ‘RYB kindergarten child abuse incident’ (11/22/2017) (
In this study, we investigated 44 274 public emergencies in China over the past decade, from the perspective of managing the risks from the source and initial causes. The proposed model can help grasp the key risk factors and quantitatively assess the risk level at the early stages of emergencies, providing decision-making guidance to quickly respond to potential risks in the emergencies and to propose coping strategies according to different risk factors and risk levels, thus taking the initiative in the control of public opinion.
This research started from the ‘5W1H’ methodology. Based on the historical data of 44 274 public emergencies in China, combined with statistical analysis, correlation analysis, text analysis and expert knowledge, we have identified five major risk factors: risk time, risk location, risk population, risk psychology and risk element. Then, we build a risk matrix that is suitable for China’s national conditions based on these five risk factors. We also made a quantitative assessment of the comprehensive risk level of specific cases through a combination of the risk matrix, the Borda count and an AHP.
In the proposed model, the following highlights need to be mentioned. First, in the process of managing or controlling public opinion during an emergency, analysing historical data and summarising the experience of predecessors play a significant role. Based on the accumulated huge amount of historical data, this article identifies five types of risk factors that are then combined with expert knowledge toward the reliable establishment of risk matrix for emergencies. Second, in a traditional risk matrix, the risk level is generally divided into three levels. This article innovatively divides the risk level into five levels, namely ‘low’, ‘relatively low’, ‘medium’, ‘relatively high’ and ‘high’, which makes the assessment of risk in emergencies more accurate and more scientific. Third, through the risk matrix, the risk level of each risk factor is obtained. However, different decision-makers will focus on different risk factors, resulting in different proposals and actions. In addition, the merely mechanical summary of the risk levels for different risk factors may fail to truly reflect the overall risk level. Considering all these factors, the use of multiple quantitative methods to assess the overall risk level in this article is more scientific, objective and comprehensive. This article shows the application in public safety emergency. Further research will focus on other types of emergencies, such as the public health emergency like COVID-19. Since the global outbreak of coronavirus disease pandemic between the end of 2019 and the beginning of 2020, it has attracted extensive attention of scholars from all over the world, which is a typical major public health emergency. The World Health Organization has also announced the outbreak as a Public Health Emergency of International Concern. The ‘5W1H’ methodology and the improved 5 × 5 risk matrix will be used for risk level evaluation of the major global emergency.
The quantitative evaluation process of the risk levels in emergencies in this study is highly applicable. With its application value and practical significance, it may well improve the government’s management ability and scientific level of decision-making.
The authors have declared that no competing interests exist.
All authors contributed equally to this work.
The authors confirm that ethical clearance was not required for the study.
This work was supported by the National Natural Science Foundation of China (NSFC) (71503246, 71840015, 72074206, 71573247, 72074205) and the Presidential Foundation of the CAS Institutes of Science and Development (CASISD) (Y9X1711Q01).
Data sharing is not applicable to this article as no new data were created or analysed in this study.
The views and opinions expressed in this article are those of the authors and do not necessarily reflect the official policy or position of any affiliated agency of the authors.