Research

I work on research that is industry-relevant, academically-rigorous and translatable to my teaching.

My research interests are in Sales and Operations Planning (S&OP), supply chain coordination, container shipping, logistics sustainability and reverse logistics, with more than 20 publications in reputable peer-reviewed journals, book chapters, conference proceedings and policy consultation reports. I have also been interviewed for a Bloomberg news article on my research on foldable containers.

Sales and Operations Planning (S&OP)

S&OP is a form of organisational and supply chain coordination. My research focuses on the links between Coordinating Mechanisms and Supply Chain Performance, via the use of Structural Equation Modelling (SEM). I am particularly interested in the mediating roles that Coordinating Mechanisms may play in their effects on Supply Chan Performance. SEM is a data analytics tool that can be used to develop multiple mediator models to demonstrate multiple mediational processes in the relation between an independent and a dependent variable.

Transportation and Shipping

My interest is primarily in the study of imbalanced flows in global container shipping and revenue management. Imbalanced flow is probably the most important reason why containers are often transported empty. There is generally at least one less demand intensive leg that is termed the ‘back haul’ of a round trip. My research is focused on helping carriers undertake yield management at the operational level in the back haul market to improve financial performance, as well as in strategies on dynamic pricing under uncertainty.

Third-Party Logistics (3PL)

3PL services are traditionally highly transactional, which leads to low profit margins and low customer loyalty. The modern 3PL model calls for providers that can provide value-added services for their customers. My research focuses on how 3PLs can build strategies to adapt to the "4th Industrial Revolution" via disruptive innovation, scientific management and agility. Another subject related to third-party logistics which I am interested in is service parts and reverse logistics, as well as their roles in fostering environmental sustainability.

The following are the abstracts of some of the peer-reviewed research papers that I have published in reputable journals (ISI-IF 4 to 5+, ABS 2 to 3, ABDC A/A+, SJR 1st quartile).


Managing bids at the engineering–commercial interface: a systems, integration and contingency perspective

Wong, S.L.A. and Goh, S.H.., Journal of Manufacturing Technology Management, 2022

Bid management is an important presales process that involves not just pricing but also determining requirement fit and managing ambiguities. The purpose of this paper is to investigate the challenges of coordinating bid activities across the engineering–commercial interface from the systems thinking, contingency, coordination and engineering perspectives. A thematic analysis of an internal survey and four embedded case studies were conducted on multiple affiliated business units across diverse product segments and geographic markets in the electronic manufacturing services (EMS) industry. The results show that challenges in any EMS bid can be distilled into the inter-related categories of price/cost, quote lead time, cost-accuracy, coordination and technical knowledge/capability. Moreover, the embedded cases suggest that engineering-based solutions, such as quality function deployment, target costing and value engineering, can be useful if suitably applied, but fulfilling diverse bid requests using generic processes can hinder effective bid management. The authors propose three principles in a framework for EMS bid management, namely (1) bid management can be modelled as an open system; (2) process focus and integration mechanisms are structural requirements in effective bid systems; and (3) a contingency approach can help alleviate the increasing complexity of bids. This study contributes to the literature by proposing a contingency model of engineering-based approaches according to product archetype and a practical framework for bid management to drive intra-organisational coordination and competitive bids in the EMS industry.


Sales & Operations Planning Culture and Supply Chain Performance: The Mediating Effects of Five Coordination Mechanisms

Goh, S.H. and Eldridge, S., Production Planning & Control, 2022

This paper investigates the role of culture as an antecedent of superior outcomes in Sales and Operations Planning (S&OP). By viewing S&OP coordination mechanisms as an S&OP team’s internal means of coping collectively with challenges to be resolved in a supply chain, five S&OP coordination mechanisms were hypothesised to act as mediators between “S&OP Culture” and Supply Chain Performance in a multiple mediator model. Results from a global survey of S&OP practitioners suggest that while a strong S&OP culture leads to better overall coordination outcomes, the former’s effects are primarily transmitted indirectly via the Strategic Alignment and Information Acquisition/Processing coordination mechanisms. However, S&OP Culture may simultaneously suppress Supply Chain Performance through the S&OP Procedure/Schedule mediator. Organisations implementing S&OP can therefore benefit from a culture of contextual ambidexterity by allowing S&OP teams to make their own judgments to strike a balance between alignment and adaptability during production planning.


Sales and Operations Planning: The Effect of Coordination Mechanisms on Supply Chain Performance

Goh, S.H. and Eldridge, S., International Journal of Production Economics, 2019

Sales and Operations Planning (S&OP) is a means of facilitating cross-functional coordination, such as across the marketing-operations interface, but adopters of S&OP have not all benefited from S&OP to the same extent. This paper investigates the effect of S&OP on supply chain performance using the perspective of coordination and contingency theories. A structural equation model was developed in which six S&OP coordination mechanisms were hypothesized to contribute to improved supply chain performance. The model was tested using a global survey of 568 experienced S&OP practitioners. Our results indicate that Strategic Alignment and Information Acquisition/Processing are the mechanisms that most significantly enable superior S&OP outcomes. However, we find that a highly formalized S&OP Procedure inhibits supply chain performance. Furthermore, using a contingency theory perspective, increasing firm size and increasing experience in S&OP amplify the negative effect of a standardized S&OP Procedure upon supply chain performance. Our results suggest that organizational bricolage may be a coordinating mechanism of effective S&OP programs and that managers should empower ambidextrous S&OP teams to maintain balance using self-governing event-driven processes. This paper makes a novel contribution to the S&OP literature by providing evidence of a theoretical construct (organizational bricolage), which may trigger a re-evaluation of the efficacy of prescriptive S&OP procedures that have been advocated by some researchers and practitioners.


The Impact of Foldable Ocean Containers on Back Haul Shippers and Carbon Emissions

Goh, S.H., Transportation Research Part D: Transport and Environment, 2019

The global cost of repositioning containers is enormous and foldable containers have been proposed as one way to address the problem. This study investigates foldable shipping containers from the shipper and sustainability perspectives. In particular, the viability of foldable containers as an instrument of carbon offsetting for the shipping industry is explored. A shadow pricing approach has been adopted to predict the impact of foldable containers on the shipping rates faced by back haul shippers in the Trans-Pacific Westbound trade. The carbon abatement impact from the use of foldable containers is also estimated via an operational activity-based approach, considering inland intermodal transport, truck idling, terminal handling and folding/unfolding. Results show that if foldable containers become prevalent, inland exporters in the Trans-Pacific Westbound trade could face an average of nearly US$500 per FEU (forty-foot equivalent unit container) increase in spot freight rates for the network studied. Furthermore, the impact of foldable container on carbon avoidance is assessed to be up to 0.4 tonne per FEU annually when deployed in a round-trip liner service in the same network. The results imply that while foldable containers would narrow the gap in freight rates between the head haul and back haul trades, back haul inland shippers would be worse off. Furthermore, emissions abatement from the use of foldable containers would be modest, which limits the role that such containers can have in any proposed “cap-and-trade” schemes. This finding has policy implications on the governance of green incentives and carbon accounting in the shipping industry.


Barriers to Low-Carbon Warehousing and the Link to Carbon Abatement: A Case from Emerging Asia

Goh, S.H., International Journal of Physical Distribution & Logistics Management, 2019

Warehouses are large emitters of greenhouse gases and their impact on climate change is under increasing focus. The purpose of this paper is to investigate the barriers that inhibit the adoption of low-carbon warehousing in Asia-Pacific and their links to carbon abatement performance. An exploratory conceptual model was first developed from a literature review of the general barriers to sustainable supply chain practices and hence potentially in low-carbon warehousing. A large contract logistics services provider in the Asia-Pacific served as the subject of a case study. The perceived barriers to low-carbon warehousing were derived from an internal survey of respondents from the case company and regressed against carbon abatement outcomes at that organization’s operations across the region. Findings – Results show that the case company reduced carbon emissions by 36 percent on a revenue-normalized basis between 2008 and 2014, but with relatively lower success in emerging markets vs mature markets. An Elastic Net regression analysis confirms that technology and government-related factors are the most important barriers in the case company’s efforts to “decarbonize” its local warehousing operations. However, results suggest that the customer-related barrier, which is highly correlated with the government barrier, is in part driven by the latter. This case study is based on a single multinational company in Asia-Pacific, but nonetheless serves as an impetus for more cross-sectional studies to form an industry-wide view. An extended stewardship framework based on the natural resource-based view has been proposed, in which logistics services providers take on a proactive boundary-spanning role to lower the external barriers to low-carbon warehousing.

Operational Shadow Pricing in Back Haul Container Shipping

Goh, S.H. and Chan, Y. Transportation Research Part E: Logistics and Transportation Review, 2016

Minimum acceptable rates for back haul cargo are difficult for carriers to establish in practice. They depend on complex factors such as availability of empty containers in the vicinity, cost of repositioning empties and container on-hiring decisions. A shadow pricing and “shadow credit” approach is proposed and applied to an inland network. Such a model can help carriers undertake yield management at the operational level to improve financial performance in a post-conference era. Results also suggest a positive relationship between variability in the imbalance situation of laden containers in a particular trade and volatility of short-term back haul freight rates.


New Product Introduction and Supplier Integration in Sales and Operations Planning: Evidence from the Asia Pacific Region

Goh, S.H. and Eldridge, S., International Journal of Physical Distribution & Logistics Management, 2015

The purpose of this paper is to investigate the implementation and performance benefits of sales and operations planning (S&OP) within organizations in Asia Pacific. A case study method was used, with two companies selected. The first company had recently commenced S&OP and applied it to facilitate new product introduction, while the second had integrated its supplier into an existing S&OP program. Supply chain performance data were collected and analyzed in the context of an S & OP maturity framework. Both cases show significant improvements in supply chain performance. In one case, the implementation of a common form of S&OP resulted in a 67 percent reduction in order lead time for newly introduced products. The second case demonstrated a 30 percent reduction in inventory levels and a 52 percent improvement in forecast accuracy through more advanced S&OP processes. This paper studies just two companies and is not intended to be representative of outcomes at all companies implementing S&OP. Further studies are required for a more generalized picture of S&OP implementations in the Asia Pacific region to emerge. The findings illustrate the potential quantitative benefits of adopting S&OP and the circumstances under which these benefits may be achieved. The results are also supportive of the notion of a maturity model for S&OP implementations. This paper strengthens the link between practitioner and academic literature by providing empirical evidence of the benefits of S&OP. Furthermore, the findings are derived from the Asia Pacific region for which there have been few academic studies on S&OP to date.