Abstract
Background: In an era marked by rapid technological advancements, the manufacturing sector is increasingly adopting Fourth Industrial Revolution (4IR) technologies to streamline sourcing processes within supply chains. Sourcing and supplier management are crucial to achieving competitive advantages, cost reductions and sustainable practices.
Objectives: The study examines the application and the integration of various 4IR technologies in sourcing activities to achieve improved supplier selection, cost control, on-time delivery and supply chain resilience.
Method: A systematic literature review (SLR) was conducted, following a structured methodology across five stages: database selection, keyword generation, application of filters (inclusion and exclusion criteria), search area selection and final document review. The Scopus database was used for data collection, and VOSviewer was employed for keyword co-occurrence analysis.
Results: Out of 1530 documents, 16 relevant studies were identified, highlighting the usage of specific 4IR technologies in the sourcing process. Simulation, Internet of things (IoT), machine learning (ML), additive manufacturing and radio frequency identification (RFID) were found to be critical technologies.
Conclusion: Fourth Industrial Revolution technologies are pivotal in optimising sourcing Key Performance Indicators (KPIs), although gaps exist in the literature around ethical sourcing, augmented reality and cybersecurity. Moreover, the study identifies emerging trends such as crowdsourcing and IoT, which indicate a shift towards data-driven decision-making in sourcing.
Contribution: This study serves as an eye-opener to unveil appropriate 4IR technologies that could be deployed by supply chain managers to ensure effective manufacturing sourcing operations. The study also unveils further research on ethical sourcing and cybersecurity.
Keywords: 4IR technologies; sourcing; supply chain; manufacturing; systematic literature review.
Introduction
The effective management of supply chain processes in conjunction with the support and collaboration of all stakeholders, is a key priority for manufacturing organisations seeking to strengthen their competitive edge and maximise profits (Jermsittiparsert & Rungsrisawat 2019). Hence, inefficiencies within the sourcing phase, including poor supplier relationships, affect organisational profits in terms of increased costs and hinder brand image, thereby weakening the organisations’ competitiveness leverage (Charles & Ochieng 2023). Therefore, the sourcing, selection and management of suppliers have become essential to operational effectiveness and organisational sustainability, thereby prompting organisations to adopt strategic sourcing practices (Mubarik, Kazmi & Zaman 2021). Strategic sourcing in manufacturing aims to maximise value in acquiring raw materials, enhancing environmental sustainability and fostering collaboration with suppliers (Van Hoek & Thomas 2021). Ekechukwu (2024) emphasises that sourcing aims to align an organisation’s supplier network with its operational needs to increase productivity, lower costs, maintain quality standards, meet delivery deadlines and comply with legal requirements. Literature has highlighted that concepts such as ethical sourcing, green strategic sourcing, sustainable sourcing, green supplier selection and sustainable supplier selection improve the triple bottom line of people, planet and profits (Liu, Chen & Zhu 2023). Accordingly, to achieve key strategic performance objectives in sourcing, organisations are increasingly incorporating Fourth Industrial Revolution (4IR) technologies into the sourcing phase of the supply chain. The adoption of 4IR technologies in supply chain systems has gained momentum, with studies examining the benefits of these technologies for supply chains, including optimisation, digital visualisation, information integration, data security, enhanced research and development, and green supply chain practices (Ali 2022; AlMulhim 2021; Nasiri et al. 2020; Wu et al. 2016; Zhao, Hong & Lau 2023). Hence, the aim of the study is to examine industry 4.0 technologies adopted to improve the supply chain sourcing phase in manufacturing organisations.
Key 4IR technologies, on the one hand, include advanced robotics, which involves using robots for various tasks that replicate human actions (Jindal & Kaur 2021); artificial intelligence (AI) and machine learning (ML), which enable machines to learn and make decisions, perform tasks and predict outcomes based on data analysis (Rai et al. 2021); and big data, which focusses on predicting future outcomes rather than merely reporting past ones (Belhadi et al. 2019). On the other hand, it includes augmented reality (AR), which enhances real-world experiences through computer-generated visuals, sounds and other effects (Bai et al. 2020); simulation technology, which allows for the recreation of real-world processes or systems in controlled, repeatable environments (Mourtzis 2020); system integration which can be described as a process that combines various computing systems and software to produce a larger system (Wang et al. 2021); and additive manufacturing (AM) also known as 3D printing technology, which is described as a manufacturing method that enables the layer-by-layer addition of three-dimensional design models through direct production. Additive manufacturing offers an opportunity to lower material usage and associated inventories because it is intrinsically less wasteful and only uses raw materials where necessary (Kunovjanek & Reiner 2020). In addition, cloud computing, on one end, is a concept that combines computing, storage and network infrastructure as one platform that offers faster innovation, economies of scale, flexible resources and computer services (Bashar 2019), while cyber security, on the other end, is described as a technique for keeping data safe against theft, hacking and other threats (Bai et al. 2020). Radio frequency identification (RFID) technology and the Internet of things (IoT) are described as a technology using wireless communication between two objects (one as a tag and the other as a reader) to automatically track and identify these objects (Bai et al. 2020) and a technology that can embed a network of physical items with sensors or both sensors and software to connect and allow them to exchange data and systems over the Internet (Garg et al. 2022).
Methodology
This study used a systematic literature review (SLR) technique. An SLR is a research approach that collects, classifies and assesses different existing research studies using a logical procedure (Mohamed Shaffril, Samsuddin & Abu Samah 2021). This method is adopted to ensure and provide comprehensive evidence and a bias-free approach (Al-Zubidy & Carver 2019) towards the examination of applicable 4IR technologies to optimise the sourcing phase in a manufacturing organisation. An SLR methodology developed by Carrera-Rivera et al. (2022) was adapted to complete the systematic review and accomplish the primary goal of the study.
The methodology consists of five steps that follow each other in chronological order. Figure 1 shows the modified step-by-step procedure, which includes: database selection, keywords generation, filters (inclusion and exclusion criteria), where to search (in the database) and lastly, the review.
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FIGURE 1: Methodology for systematic literature review. |
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An SLR encourages researchers to find studies outside of their own subject areas and networks by introducing comprehensive searching techniques, specified search strings, and established inclusion and exclusion criteria (Paul et al. 2021).
Database selection
Selecting an appropriate database is a critical step in ensuring the validity of literature review studies, as the quality of sources directly impacts the reliability and depth of the research findings (Carrera-Rivera et al. 2022). For this study, the Scopus database was chosen because of its extensive indexing of high-quality, peer-reviewed literature across diverse disciplines. As noted by Abalkina (2024:395), Scopus is recognised internationally as a premier bibliographic database that prioritises indexing reputable and influential journals. This makes it particularly valuable for academic and scientific research, offering a reliable platform for accessing credible and comprehensive sources. Scopus’s rigorous verification process ensures that researchers can access in-depth and reliable research materials, which strengthens the foundation and integrity of scholarly work (Baas et al. 2020). Additionally, Scopus’ advanced search capabilities and broad coverage enable researchers to conduct thorough literature reviews, track citation trends, and identify key studies and emerging topics within their fields, making it a powerful tool for supporting high-quality research.
Database search keywords
This step used keywords in the form of search string to source documents on related topics. Boolean operators like ‘AND’ were used to search for documents that contain all of the identified keywords, while the boolean operator ‘OR’ was used to search for documents that contain either of the identified keywords. ‘Parentheses ( )’ on the other hand was used to group multiple keywords and search for documents that contain the grouped keywords in a specific order, and ‘asterisks*’ on the search string were used to search for documents that contain variations of the root word. Lastly, quotation marks “” were employed to search for the exact phrase in the quotation marks. The Boolean search string of keywords used in this study is (‘Sourcing’ OR ‘Procur*’ OR ‘Buying’ OR ‘supplier selection’ OR ‘Purchas*’ OR ‘reliable supplier lead*’ OR ‘on-time delivery’ OR ‘on time delivery’ OR ‘shorter purchase order cycle time’ OR ‘ supplier availability’ OR ‘vendor availability’ OR ‘supplier defect rate’ OR ‘supplier compliance rate’ OR ‘purchase order accuracy’ OR ‘procurement return on investment’ OR ‘price competitiveness’ OR ‘cost per purchase order’ OR ‘Sustainable sourcing’ OR ‘Sustainable buying’ OR ‘Sustainable purchasing’ OR ‘Sustainable procurement’ OR ‘Sustainable supplier selection’ OR ‘Green sourcing’ OR ‘Green buying’ OR ‘Green purchasing’ OR ‘Green procurement’ OR ‘Green supplier selection’ OR ‘Ethical sourcing’ OR ‘Ethical buying’ OR ‘Ethical purchasing’ OR ‘Ethical procurement’ OR ‘Ethical supplier selection’) AND (‘4.0 technology’ or ‘4IR technology’ OR ‘industry 4.0’ OR ‘fourth industrial revolution technology’ OR ‘4.0 technologies’ OR ‘industry 4.0 technology’ OR ‘artificial intelligence’ OR ‘machine learning’ OR ‘big data’ OR ‘data mining’ OR ‘augmented reality’ OR ‘simulation’ OR ‘system integration’ OR ‘additive manufacturing’ OR ‘3D printing’ OR ‘cloud computing’ OR ‘cyber security’ OR ‘RFID technology’ or ‘internet of things’ or ‘IoT’ or ‘digital tw*’) AND (‘Manufacturing’ OR ‘Production’). The first part of the string was focussed on sourcing activities and key performance indicators, the second part separated by the ‘AND’ operator focussed on the 4IR technologies, while the last part focussed on the sector, that is, manufacturing sector.
Filters: Inclusion and exclusion criteria
This step centred on establishing inclusion and exclusion criteria for the document search. The first criterion was the publication period, limiting the review to documents published between 2019 and October 2024 to ensure the incorporation of recent and relevant literature. The second and third criteria addressed document and source types, restricting the review to journal articles and conference papers. Additionally, only documents presented in English were included in the literature review.
Database search area (where to search)
Databases like Scopus provide options for specifying the location of keyword searches, allowing searches within the study title, abstract, keywords or a combination of these fields, among other configurations. In this study, the constructed Boolean search strings were applied across the title, abstract and keywords to maximise the inclusion of relevant documents. This approach was chosen to ensure a comprehensive coverage of pertinent literature. The documents retrieved from this step were exported and analysed using VOSviewer to determine co-occurrences of keywords and also, the Scopus ‘analyse results’ feature was used to summarise the number of documents contributed annually within the period range, countries and sources.
Review of keywords
The last step was focussed on the review of the document keywords; only documents that focussed on the application of 4IR technologies in the sourcing phase of supply chain within manufacturing companies were further analysed. The title of the study, year of publication, authors, the objective and the applied 4IR technology were summarised.
Section ‘Discussion of results’ summarises results obtained from the described methodology.
Ethical considerations
Ethical clearance to conduct this study was obtained from the Ethics and Plagiarism Committee (FEPC) of the Faculty of Engineering and the Built Environment at the University of Johannesburg (reference no.: UJ_FEBE_FEPC_01196).
Discussion of results
Following the initial four steps of the methodology, 1,530 documents were retrieved from the Scopus database, comprising 930 journal articles and 600 conference papers. The distribution of documents by publication year was as follows: 173 in 2019, 215 in 2020, 257 in 2021, 299 in 2022, 304 in 2023 and 282 in 2024 to date. This output from 2019 to 2022 indicates a linear growth trend in publications on the topic, as illustrated in Figure 2.
A total of 133 sources, including conferences and journals, contributed to these publications, with contributions per source ranging from 2 to 31 documents. The top 10 contributing sources are as follows: AIP Conference Proceedings (31 documents), Sustainability (Switzerland) (28 documents), Energies (24 documents), ACM International Conference Proceedings Series (19 documents), and Applied Sciences (Switzerland), Computers and Industrial Engineering, International Journal of Production Research, and Journal of Physics Conference Series each contributing 16 documents. Additionally, IFAC PapersOnLine and the International Journal of Production Economics each contributed 15 documents. The analysis also identified China as the leading contributor, with 271 publications on the topic. The top 10 contributing countries are China (271), the United States of America (219), India (175), Germany (118), Italy (83), the United Kingdom (71), Indonesia (56), Iran (43), France (40) and South Korea (38). A summary of these findings is provided in Figure 2.
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FIGURE 2: Summary of published documents from 2019 to date that is, October 2024: (a) documents by year, (b) documents by country or territory, (c) documents by year, and (d) documents by type. |
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Using VOSviewer, a co-occurrence map was generated, as shown in Figure 3. The map visualises frequently co-occurring keywords: the shorter the distance between two keywords, the more often they co-occur; larger nodes indicate a higher frequency of keyword appearance; and lines between nodes represent the links between keywords (Irawan, Rosjanuardi & Prabawanto 2024; Yu et al. 2020).
In creating the map with VOSviewer, data from the 1530 documents retrieved from the Scopus database yielded a total of 12 539 unique keywords, each appearing at least once across the documents. VOSviewer allows for setting a minimum occurrence threshold for keywords to be included in the visualisation. For instance, setting the threshold at 5, 10 and 15 occurrences resulted in 699, 265 and 157 keywords, respectively. For this study, a threshold of at least 15 occurrences was selected, resulting in keywords grouped into five clusters. Each cluster represents keywords that frequently co-occur, suggesting thematic relationships. A summary of these clusters is provided in Table 1.
TABLE 1: Clusters of keywords that co-occur. |
The keywords with the biggest visible nodes include the terms: sales, costs, decision making, supply chain, supply chain management, AI, ML, industry 4.0, simulation, IoT and 3D printing, which indicate that these keywords frequently occur in this topic. The map further illustrates that key activities and KPIs in the sourcing phase of the supply chain co-occur with some of the 4IR technologies, for example, looking at supplier selection which is closely related to IoT, ML and AI, while purchasing is closely positioned next to simulation, ML, AI, 3D printing, data mining and IoT. On-time delivery is closely linked to AI, IoT, discrete event simulation, and sustainability, and sustainability development is close to simulation and 3D printing, and lastly, cost reduction is not close to, or linked to any 4IR technology which indicates a gap in the literature.
Based on Table 1, there are clusters 1, 2, 3, 4 and 5 represented by the colours red, green, blue, yellow and purple, respectively, on the network map. The red cluster is dominating with 61 keywords, while the purple cluster consists of only 9 keywords. Following the findings on the network map, cost reduction is found in the green cluster, which dominates and is focussed on renewable energy. There are no common 4IR technologies found in this cluster, which collaborate with the observation in Figure 3. It is also noted that within the clusters, all keywords with cost variants are in the green cluster, except for cost-effectiveness which is in the blue cluster sharing a theme with 4IR technologies such as 3D printing also known as Additive Manufacturing (AM).
Application of Fourth Industrial Revolution technologies in the sourcing phase of manufacturing supply chains
This section presents the results of the final step (step 5) of the SLR methodology. The search resulted in 118 documents. These documents were browsed to identify only studies that focussed on applying 4IR technologies for sourcing activities and their corresponding KPIs within the manufacturing sector. As summarised in Table 2, only 16 documents were applicable. The review highlighted that nine of the 4IR technologies were applied in the sourcing phase of the manufacturing supply chain. The review also revealed that some studies used more than one 4IR technology to improve sourcing activities. It was also noted that research studies published in 2020 did not meet this criterion.
TABLE 2: Summary of documents that applied Fourth Industrial Revolution technologies within manufacturing organisations’ supply chain sourcing phase. |
Based on the 16 documents, blockchain, cloud computing and big data were each used one time, RFID ‘radio frequency identification’, and digital twin were each used two times, while AM and ML were each used three times, and lastly, simulation and IoT were each used four times. This information was used to develop a Pareto analysis, as depicted in Figure 4; this was carried out to prioritise the key 4IR technologies applicable to the sourcing phase of the manufacturing supply chain.
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FIGURE 4: Pareto analysis of Fourth Industrial Revolution technologies applied in the sourcing phase of manufacturing supply chains. |
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In addition to the above findings, the term Internet of beings is categorised into ‘Internet of things’ for this study and crowdsourcing emerged from the review. While the sourcing phase is traditionally linked to activities that aim to obtain raw materials for production purposes, in this digital era, sourcing information is equally important for manufacturers to make operational and strategic decisions. These studies, in addition, proposed future research work, which ranges from the integration of more data and data sources to optimise decision-making to studies that will develop cost-effective adoption of the technologies; these proposed future studies are summarised in Table 2.
Based on an 80/20 Pareto analysis (Figure 4), simulation, IoT, ML, AM and RFID emerged as the critical few 4IR technologies. However, through observation, RFID appears to have been included arbitrarily, as it holds equal weight with digital twin, which did not meet the 80% threshold. Therefore, digital twin will also be included as one of the critical technologies to ensure effective sourcing operations.
Discussion of key results
Multiple keywords forming a string were used to identify relevant literature with a view of achieving the main objective of the study; with that, activities and KPIs within the sourcing phase were predetermined and thus all keywords were covered by literature whether verbatim or by inference, except for ethical sourcing and similar keywords. The reviewed literature provides no insight into ethical sourcing and the application of 4IR technologies thereof. In addition, the 4IR technologies were also predetermined. However, the results of the review clearly demonstrated a lack of coverage regarding the application of AR, data mining, AI, system integration and cyber security in the sourcing phase of manufacturing supply chains. While these predetermined 4IR technologies were not covered, the application of blockchain, which was not part of the initially predetermined keywords emerged, which indicates that the scope of the literature search was not fully dependent on the predetermined keywords.
The study searched for literature from 2019 to 2024 to date. While it was revealed through the results of the first four steps that 215 documents were published in 2020, none of these documents included the application of 4IR technologies in the sourcing phase. The year 2020 was full of uncertainties; while other businesses strongly invested in technology, others paused on investments so as to be financially safe should they be forced to close doors. In addition, academics may have focussed their research lens on the impact of coronavirus disease 2019 (COVID-19) and other topics related to the pandemic in that period.
The study also revealed the application trend of crowdsourcing in sourcing services for a manufacturing organisation. Attention has always been given to sourcing raw materials, especially in manufacturing organisations; however, this study brings forth the importance of sourcing data and information for sourcing decisions in manufacturing organisations for both services and materials. The question, therefore, arises: should crowd-sourcing become a norm for procurement or sourcing teams in manufacturing organisations? Another concept that emerged was the Internet of beings which focusses on the connection of people and machines on the Internet, and this is for the purposes of collecting and analysing data. As it stands, organisational data are vulnerable and prone to cyber-attacks. Thus, another research issue that needs to be investigated is whether the increase in scope for connections between people and machines will increase the volatility and risk of cyber-attacks.
The conclusion section draw inferences based on the study’s findings and offering relevant recommendations for stakeholders involved in raw material sourcing within the global supply chain community.
Conclusion and recommendations
This review concludes that 4IR technologies significantly enhance sourcing processes in manufacturing, improving efficiency, cost reduction and supplier collaboration. Internet of things, simulation, ML and AM are especially effective in addressing sourcing KPIs, such as supplier selection, on-time delivery and inventory management. Blockchain technology contributes to data security and transparency in supplier relationships. Notably, while 4IR technologies address many sourcing KPIs, gaps remain in ethical sourcing and cyber security applications. The absence of ethical sourcing applications and minimal application of certain 4IR technologies, such as AR and system integration, indicate areas for further research.
Manufacturing firms should integrate multiple 4IR technologies such as IoT, blockchain and ML to achieve optimised sourcing processes, cost control, sustainability practices and real-time decision-making within the supply chain. Manufacturing organisations should consider using crowdsourcing platforms to gather data insights for sourcing decisions, allowing for real-time adjustments to supplier and production needs in response to market changes.
While the existing literature primarily concentrates on the broad benefits of adopting 4IR technologies to optimise supply chains holistically, this study takes a more focussed approach by identifying specific 4IR technologies that can significantly optimise sourcing processes in manufacturing organisations. It delves into the various applications of these technologies, examining their potential impact on sourcing efficiency, cost reduction and overall operational performance. Furthermore, this study highlights a range of 4IR technologies successfully integrated into manufacturing organisations to improve their sourcing activities. The study illustrates how these technologies have addressed unique sourcing challenges by providing detailed case studies and examples from different manufacturing sectors. Although there may be variations in the specific needs of organisations, the insights provided in this study serve as a comprehensive benchmark for manufacturing entities seeking to choose and implement the most suitable 4IR technologies for optimising their sourcing processes. These findings can therefore guide decision-makers in making informed decisions given the wide range of 4IR technology alternatives.
Future research should focus on crowdsourcing as a means of data sourcing in procurement, potentially reducing information asymmetry and enabling more informed decision-making in supplier selection and sourcing. Augmented reality, system integration and cyber-security-oriented 4IR technologies should be studied further for their potential roles in the sourcing phase of supply chain systems used in a manufacturing organisation.
Acknowledgements
Competing interests
The authors declare that they have no financial or personal relationships that may have inappropriately influenced them in writing this article.
Authors’ contributions
R.L.S. initiated the conception of the research study and collected and analysed the data used in the project. O.A.M. and T.M. contributed to finalising the research study concept and enhancing the quality of the data analysis and discussion of the results presented in the manuscript. R.L.S. prepared the first draft of the manuscript, while O.A.M. and T.M. conducted the critical review and revision. All authors, R.L.S., O.A.M. and T.M., read and approved the final manuscript.
Funding information
This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.
Data availability
All data that support the findings of this study are available from the corresponding author R.L.S., upon request with full anonymity of participants.
Disclaimer
The views and opinions expressed in this article are those of the authors and are the product of professional research. It does not necessarily reflect the official policy or position of any affiliated institution, funder, agency or that of the publisher. The authors are responsible for this article’s results, findings and content.
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