Abstract
BACKGROUND:
Recent studies concerning supply chain management have shown that topics such as supply chain risk management (SCRM) and supply chain resilience (SCRes) are the new trends in supply chain management. Initial studies in the early 2000s developed frameworks to identify, measure and mitigate risks and assess/evaluate the degree of resilience of a company or supply chain. Recently, a large variety of studies has emerged, including more conceptual and review studies as well as more sophisticated, quantitative studies. However, studies on human-related factors are still lacking, and there is no systematic method to answer questions such as “What literature is available concerning human factors related to SCRM and SCRes?”, “Which human factors contribute to SCRes?” and “Which human factor can amplify SC Risks?”
OBJECTIVE:
The main goal of this paper is to conduct a systematic literature review to identify human factors that impact supply chain resilience and supply chain risk management.
METHOD:
This study was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method. The objective of using this review protocol is to ensure that the review has the minimum amount of bias due to research expectations.
RESULTS:
This study highlighted a summary of human-related risk and resilience factors as well as a discussion about these preliminary findings.
CONCLUSIONS:
As our main conclusion, we highlight that human factors may generate significant risks in the supply chain, nevertheless, there are other human factors that must be nourished to obtain SCRes.
Introduction
Recently, topics such as supply chain resilience (SCRes) and supply chain risk management (SCRM) have been studied more frequently. Currently, due to the urge to offer leaner services, supply chains have become more vulnerable in terms of natural and man-made disasters [1]. As both of these topics are becoming more consolidated in the literature, many researchers are investigating different risk/resilience mitigation strategies, including collaboration [2], innovation [3, 4], safety [5], SCRes assessment and metrics [6–8], and review papers [9–12]. In this context, there are also human factors, which can be either an asset, considering, for example, mutual trust [13, 14] and openness [15], or a hazard, considering factors such as poor customer service [14] and dishonest pricing [16]. To create a model that implements both a supply chain management and behavioral approach in the supply chain management context, it is crucial to develop models that describe human behavior [17]. This paper aims to fill this gap by presenting a systematic literature review to identify human factors that impact SCRes and SCRM.
Literature review
Supply chain risk management
Companies should focus not only on their own particular risks but also on risks related to the whole supply chain (SC) [18]. Four basic risk constructs should be distinguished [19]: supply chain risk sources, risk consequences, risk drivers and risk mitigating strategies. Supply chain disruptions can be financial losses, a negative corporate image, a bad reputation or damages in security and health [19]. The focus of supply chain risk management (SCRM) is to understand and avoid business disruptions in a supply chain [20]. In general, companies implement risk management at an organizational level only, and there is not sufficient evidence of risk management implemented in an entire SC [20]. Risk can be defined as a mismatch between supply and demand, generating rupture in the SC [20]. Such mismatch may include information, raw materials and product flow from dirt-to-dirt [18].
Supply disturbances include: supply insolvency, war, supplier failure, natural hazards/disasters, ter-rorism, human disasters, regulatory/legal, and infrastructure [21]. Supply chain risks emerge from the disruption of supply chain flows due to disruptions of material flows, information flows, knowledge flows, and control and coordination flows [17].
Supply chain resilience
Resilient SC systems must provide adequate levels of services and protection at an affordable cost [22]. In addition, to become competitive, SC systems must be resilient to disturbances [21].
There are two main objectives for SCRes: i) to recover the desired states of a disturbed system within an acceptable time period and at an acceptable cost; and ii) to reduce the effectiveness of the disturbance by minimizing potential threats [23].
If a company emphasizes only lower costs and higher efficiency, ignoring resilience, the supply chain system may become vulnerable [24]. Although resi- lience is becoming increasingly important, there are still only a few quantitative studies on this topic [24].
Resilience is related to an adaptive capability of the SC to prepare for unexpected and/or unwanted events, respond to disruptions, and maintain continuity of operations and control [25]. An SC has to be resilient to guarantee survival [26, 27]. Resilience may also be seen as a way to overcome SC vulnerability [28] and prevent shifts to undesirable states [27].
Companies must develop strategies to obtain resi-lience. The main strategies found in literature are: redundancies, i.e. strategic stock, maintain low- capacity utilization, multiple suppliers [29–31]; Resi- lience culture [29, 32]; Information sharing among partners [31]; Supply chain integration ([32]); Business process management [29, 32] and flexibility [30].
Human factors and behavioral approach
Operations management (OM) models are built under the consideration that humans are deterministic and predictable in their actions and that they act independently of others and make decisions that are emotionless, observable, and independent of the product [33]. To develop a LARG (Lean, Agile, Resilient and Green) company, it is crucial to create a human factor-oriented approach [22]. Implementing new production systems that reduce work time and task variety (for example, lean manufacturing) requires atention to human factors to avoid health and safety problems with workers and losses to the companies. These problems include: increased number of errors, decreased productivity, absenteeism, and diminishment of employees’ morale and compensations as well as lawsuits [22].
Human, technical and environmental factors are all causal factors of accidents in transportation systems [34]. Therefore, the major method to reduce accident occurrence is enhanced operator skill development, including periodic refresher training to maintain a high level of operational efficiency [34]. Organizations are dependent on humans, and human behavior has a large role in successful collaboration [16]. The willingness to share information is critical, and individuals’ communication behavior has a profound influence on the satisfaction and commitment to collaboration because individuals communicate [35].
Behavioral operations management is a framework that extends standard OM to include human behavioral features that are not present in the traditional approach [17]. Operations often present as highly complex and dynamic settings in which individuals are obligated to solve complex problems to attain the goals of effectiveness, efficiency and quality [17]. The SCRM literature has provided important insights and has made a considerable contribution to the general understanding of causes, effects, and management of supply risk. Nevertheless, little research has been devoted to the investigation of behavioral aspects of supply risk management [17]. Considering human factors, the issue of trust seems to be of particular importance in relation to global value chains [13]. In SCRM, there are intangible elements that include, for example, risk attitudes as well as risk perceptions of users and members of supply chains [36]. Additional examples of these intangible elements include mistrust and the lack of confidence between actors in a supply chain, which can lead to actions and interventions that may lead to cost escalation [36].
Research methodology
In this study the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method was used [37] (see Fig. 1). The objective of using this review protocol was to ensure that the review had the minimum amount of bias from re-search expectations.

PRISMA protocol of the study.
In the first step, it was verified that the research scope was in line with the objectives of identifying human factors that impact supply chain resilience. Therefore, the research questions (RQ) were preci-sely formulated to avoid ambiguity [38].
RQ1 –What literature is available concerning Human factors related to SCRM and SCRes?
RQ2 –Which human factors contribute to SCRes?
RQ3 –Which human factors can amplify SC risks?
Select databases
The databases chosen for searching the research terms were Scopus and Web of Science. Scopus is the largest database of peer-reviewed literature, and Web of Science can recover documents from 1945 to the present. Previous studies [11, 41] used ABS (associationofbusinessschools.org) ranking and limited their review to journals with grades 3 or 4 (the scale goes from 0 to 4 [44]). Kilubi [41] used peer-reviewed journals with a VHB ranking (vhb.online.org/startseite) of A+, A, B or C as the selection criteria. In this paper, these restrictions were not imposed to ensure that every relevant study was collected, consistent with the methods in a previous systematic review [42].
Define search terms
The search strings were based on consolidated supply chain risk management and supply chain resilience terminologies as shown in Table 1.
Search strings used for the study
Search strings used for the study
The search took place in June 2018 and resulted in a total of 971 publications. After duplicate removal, there were 626 publications. Then, two different approaches were adopted: i) quantitative bibliometric analysis with the 626 document database using the software R (Bibliometrix package) and ii) a qualitative approach after screening all 626 articles and selecting the 22 articles that specifically addressed all research question. All the authors were involved in the screening process. Disagreements concerning paper selection were solved by a majority consensus. There were no cases where the voting was tied. We selected papers that specifically identified human factors that generated hazards (supply chain risks) or benefits (improving SCRes) to the supply chain. Steps 5 and 6 are shown in Section 4. The complete list of papers (full text) analyzed in the qualitative approach is shown in Table 2.
Papers used in the qualitative approach
Papers used in the qualitative approach
Bibliometric analysis
This section aims to provide an answer to RQ1 by showing the full extent of the bibliometric results. Figure 2 shows the article distribution over time. Figure 3 shows the top five publishing countries. The USA presents a total of 77 publications, which is more than double the number of publications for China (33 publications). Figure 4 shows the total number of citations. While the USA has the highest number of citations, the United Kingdom is the second country with more cited papers. China does not appear in the top five. Figure 5 shows the most productive authors. None of the authors in the top 10 had “Human factors in SCRM/SCRes” as the main line of research. Figure 6 shows the most cited papers concerning SCRM and SCRes. It is important to state that although SCRM and SCRes are different concepts, they are intrinsically related. Managing the risks in a supply chain creates a pathway to generate a resilient supply chain, therefore, the concepts are often discussed toghether by the authors. Most of the papers conceptualize SCRes, SCRM or both concepts. There is no well-cited paper that approaches human-related factors in SCRes/SCRM. Figure 7 shows the top publishing journals. Tables 3 and 4 show author’s dominance statistics.

Article distribution.

Top 5 publishing countries.

Top five citation countries.

Most productive authors.

Most cited papers.

Publications by journal.
Dominance factor
h-index, g-index and m-quotient and total citations
Attributes of a specific paper are connected to each other, for example, through the manuscript itself: author(s) to the journal, keywords to the publication date, etc. [61]. Furthermore, scientific publications usually reference other scientific works, generating networks that can be either co-citation or coupling networks [61]. These networks are analyzed to capture meaningful properties of the underlying research system, and in particular to determine the influence of bibliometric attributes such as scholars and journals [61]. A unit of coupling was defined by Kessler [62] as any single item of reference that is used by two papers.
Co-citation is defined by Small [63] as a new form of coupling and analyzes the frequency with which two documents are cited together. In general co-citation analysis is performed for mapping older papers and bibliographic coupling is used to map a current research front [61]. Figure 8 shows the co-citation analysis. Co-word analysis aims to build a co-occurrence network to map terms extracted from keywords, titles, or abstracts in a bibliographic collection [61]. Our keyword analysis is shown in Fig. 9. Figure 9 shows two well-connected networks, one with keywords related to SC and another with human factors keywords, which shows that these two networks are not strongly connected.

Co-citation analysis.

Keywords network.
Considering this context, the literature provides examples of human factors that generate SCRes and human factors that amplify supply chain risks. The results were generated from the qualitative analysis of the 22 papers presented in Table 2. Therefore, this section answers RQ2 (Which human factors contribute to SCRes?) and RQ3 (Which human factor can amplify SC risks?). There are also human factors that may contribute to increasing SCRes and represent the answer to RQ2. Our findings are summarized in Tables 5 and 6.
Human related resilience factors
Human related resilience factors
Human risk factors
This paper had the objective of conducting a systematic literature review of how human factors can affect supply chain resilience strategies (with either a positive or negative impact). To address this objective, we proposed three research questions: RQ1 –What literature is available concerning human factors related to SCRM and SCRes? RQ2 –Which human factors contribute to SCRes? RQ3 –Which human factor can amplify SC risks? We answered the first question via an extensive bibliometric analysis, which showed that SCRM articles often disregard human factors. To answer RQ2 and RQ3, we selected 22 papers that discussed SC human factors. Among these papers, only one paper considered human factors in the SCRM context. We mapped the factors and associated each one of them with resilience strategies previously estabilished by qualified literature. Nevertheless, we are aware of the degree of subjectivity that surrounds the analysis, which can be considered the main limitation of this paper. The next research step would be to test these literature assumptions in real-life case studies, preferably with rigorous statistical analyses. Therefore, a relevant contribution of our study is the identification of a promising research field often neglected by most hegemonic SCRM and SCRes approaches. We expect that this paper will be a first step towards mapping human factors, as we demonstrated that they can have favorable or hazardous effects on a supply chain. We also recommend optimizing the desirable human factors mapped and mitigating the unwanted factors to develop a resilient supply chain.
Conclusion
In a world that is moving towards complete process automation, it is essential to question and emphasize the relevance and impact that human factors have on the processes and relationships between supply chain companies. In this sense, this article demonstrates that human factors such as “collaboration” and “mutual trust” are essential for building supply chain resilience, while factors such as “not being honest in pricing” and “sharing irrelevant information” may lead to increased risks. To fully understand the impact of human factors in the supply chains we recommend the conduction of a systematic empirical study in order to measure these effects.
Conflict of interest
None to report.
Footnotes
Acknowledgments
The authors would like to thank the editors and the two anonymous reviewers for their valuable comments that gave an essential contribution to the paper.
