7th IFAC Conference on Manufacturing Modelling, Management, and Control International Federation of Automatic Control June 19-21, 2013. Saint Petersburg, Russia Benefits and limitations of the SCOR model in warehousing E. LEPORI *. D.DAMAND ** B. BARTH *** *HUMANIS, Ecole de Management Strasbourg,France (e-mail: elvia.lepori@em-strasbourg.eu) ** HUMANIS, Ecole de Management Strasbourg, France (e-mail: damand@em-strasbourg.eu) *** HUMANIS, INSA Strasbourg, 67000 France (e-mail: marc.barth@insa-strasbourg.fr) Abstract: In the Supply Chain, the flows of goods are the result of exchanges between two major parties: the manufacturer / industrial company / supplier on the one hand and the distributor / customer on the other. There are many intermediaries between these two parties who, depending on the nature of the service provided, can be classified as 3PL (Third-Party Logistics provider) or 4PL (4th-Party Logistics Provider). This paper focuses on the 3PL provider. A 3PL provider is a logistic services provider of the Supply Chain responsible for implementing all or part of their customers' logistics. This form of subcontracting concerns warehouse management and transport activities as well as all associated services such as co-packing. The objective of subcontracting is to improve the performance of the logistical process. Modelling and evaluating the performance of these processes helps improve the performance of the Supply Chain. SCOR model (Supply Chain Operations Reference), proposed by the Supply Chain Council, gives a modelling and an evaluation of the performance in Supply Chain. In the context of 3PL, the objective of this paper is to identify the benefits and limitations of the SCOR. The study is illustrated by a distribution warehouse case in an international logistic services provider. Keywords: Performance evaluation, SCOR, modeling, supply chain Literature proposes several reference models for performance evaluation in the Supply Chain. The models of Beamon [Beamon, 1999], Chan [Chan, 2003], Gunasekaran [Gunasekaran, 2004] and Kaplan [Kaplan, 1996] recommend a list of metrics. These models are characterised by: the classification of metrics into categories, the absence of an explicit link between metrics and standard processes. Performance metrics linked to the process respond to the following question: how to locate measures in the process? In GSCF (global supply chain forum) and SCOR (Supply Chain Operations Reference) models, the notion of process is linked to performance evaluation. According to Huan [Huan, 2004], SCOR describes all activities relating to the flow of materials and products and focuses on operational efficiency, GSCF deals with strategic aspects. The SCOR model was developed by the Supply Chain Council (SCC). It helps improve the performance of the Supply Chain [Lockamy A. III, 2004][Bolstorff, 2009] and every link of the Supply Chain [Danish, 2008]. SCOR is applicable to all links of the Supply Chain [Huang, 2005][Bolstorff, 2009]. SCOR makes it possible to model different structures of varying complexity levels [Jack C.P, 2010]. Several authors use or gain inspiration from SCOR for their models, in different domains such as the food processing [Garcia, 2012][Verdouw C.N., 2010] or construction sector [Jack C.P, 2010]. Applying SCOR to distribution warehouses can also be envisaged. The strict definition of processes and performance metrics creates a common language throughout the Supply Chain [Lambert, 2005][Danish, 2008][Huang, 2005] [Huan, 2004][Verdouw C.N., 2010]. This common language helps standardise practices and establish comparisons between Supply Chain members [Ganga, 2011]. Process standardisation is necessary to enable internal and external communication between 1. INTRODUCTION The Supply Chain (SC) is a network of production and distribution sites [Lee and Billington, 1995]. These sites provide raw materials which they process into semi-finished and then finished products. The finished products are delivered to consumers via distribution networks [Jinxiang Gu, 2007]. Distribution warehouses are key components of any Supply Chain [Jinxiang Gu, 2007]. Logistic services providers, like 3PL, offer their customers the possibility of outsourcing various activities within their warehouses, such as storage and co-packing. In a dynamic economic context, the search for competitiveness is a key factor for the sustainability of a Supply Chain [Jian Cai, 2009]. Sustained and increased competitiveness is linked to continuous performance improvement [Jian Cai, 2009]. Competition within the market requires increasingly high performances for distribution warehouses [Jinxiang Gu, 2007]. According to Gunasekaran [Gunasekaran, 2004], controlling the Supply Chain processes is crucial for improving performance. Processes are controlled through metrics measurement. This control is part of the Supply Chain Management. Supply Chain management can be defined as the coordination of the Supply Chain stakeholders [Gunasekaran, 2004]. The implementation of a performance evaluation system is not immediate. This highlights fundamental questions: what to measure? What measurement frequency? What measurement update frequency? [Beamon, 1999][Chan, 2003]. And, finally, how to locate measures in the process? It is not easy to identify and interpret the interactions between metrics. 978-3-902823-35-9/2013 © IFAC 424 10.3182/20130619-3-RU-3018.00174 2013 IFAC MIM June 19-21, 2013. Saint Petersburg, Russia Supply Chain partners [Gunasekaran, 2004][Jack C.P, 2010]. Modelling and evaluating processes helps create an audit of the the Supply Chain ("AS IS"): metric values deemed "satisfactory" and "not satisfactory". A "To Be" state describes the guidelines of the processes considered [Supply Chain Council, 2008]. SCOR helps analyse and develop a structured performance evaluation [Lockamy A. III, 2004][Bolstorff, 2009] [Persson, 2009]. This framework is based on the two-dimensional modelling of processes: a vertical dimension (using levels within the process) and a horizontal dimension (using the links between the activities making up the process) [Ganga, 2011][Huang, 2005]. The SCOR model has been applied to different processes such as production [Garcia, 2012] and construction [Jack C.P, 2010]. x x x x x A literature review failed to identify research on the theme of this paper within the scope of warehousing. The proposed contribution is the definition of the benefits, limitations and shortcomings of the SCOR model within the scope of distribution warehouses. x x The rest of this paper is structured as follows. Section 2 describes the experimental method. Section 3 describes the results of the application of the experimental method. Section 4 describes the benefits, limitations and shortcomings of the SCOR model. Section 5 concludes and proposes research perspectives. x Upside supply chain flexibility: The number of days required to achieve an unplanned sustainable 20% increase in quantities delivered. Upside SC adaptability: The maximum sustainable percentage increase in quantity delivered that can be achieved in 30 days. Downside supply chain adaptability: The reduction in quantities ordered sustainable 30 days prior to delivery with no inventory or cost penalties. SC management costs: The sum of the costs associated with the SCOR level 2 processes to Plan, Source, Deliver, and Return. Cost of goods sold: The cost associated with buying raw materials and producing finished goods. Cash-to-cash Cycle time: The time it takes for an investment made to flow back into a company once it has been spent on raw materials. Return on working capital: Return on investment of the assets of the SC (machines, tools ..). Return on Supply Chain fixed assets measures the return an organization receives on its capital invested in supply chain fixed assets. The experimental method applied consists of 3 stages: Stage 1: Selection of a logistic services provider. This logistic services provider provides its customers with various services such as transport, storage and co-packing. The warehouse activities concerned by the study are the storage of finished goods and raw materials and order picking. The customer of the logistic services provider works in the food processing sector. Stage 2: Application of the SCOR model to the distribution warehouse. The second stage is partially derived from the method proposed by the SCC [Bolstorff, 2009]. The SCOR model used is SCOR version 9.0 [Supply Chain Council, 2008]. The 4 sub-stages are as follows: - Stage 2.1: scope determination: the determination of the practical case which is the most representative (number of activities, volume of orders and turnover). - Stage 2.2: implementation of the SCORCARD of level 1 performance metrics, - Stage 2.3: "AS IS" of the process : "thread diagram" and "process diagram". - Stage 2.4: implementation of levels 2 and 3 performance metrics. 2. EXPERIMENTAL METHOD SCOR model is composed by two parts: a modelling of processes of the SC with diagrams and for each process SCOR proposes metrics. Processes are modelled with three levels: - Level 1 corresponds with the top level of the Supply Chain. It is divided into 5 processes: Plan, Source, Make, Deliver and Return. - Level 2 is a breakdown of level 1 according to the major production categories and the corporate strategy. The "thread diagram" represents the Supply Chain with the level 2 processes of the model. The choice of level 2 processes of the SCOR model depends on the production strategy. The processes concern the "Make-to-stock" category involves processes of a production linked to sales forecasts. There are two other categories: the "Make-to-order" category for production linked to customer orders and the "Engineer-toorder" category where the product is designed for a specific customer. - Level 3 describes each process making up level 2 processes ZLWK WKH ³SURFHVV GLDJUDP´. Stage 3: Identification of the benefits and limitations of the SCOR model in warehousing. Metrics are classified with the same levels as processes and with performance attributes: reliability, responsiveness, agility, costs and assets. Metrics of the level 1 are: x Perfect order fulfilment: The percentage of orders complying with delivery performance with complete and accurate documentation and no delivery damage. x Order fulfilment cycle time: The average actual cycle time consistently achieved to fulfil customer orders. The cycle time starts from order receipt and ends with order acceptance by the customer. 3. APPLICATION TO THE CASE STUDY The following section describes the results of the application of the SCOR model to a distribution warehouse. 3.1 Stage 2.1: scope determination The most representative customer of the platform is highlighted in stage 1. All activities proposed by the logistic services provider are performed for this customer. In terms of turnover and volume, this customer is one of the largest of 425 2013 IFAC MIM June 19-21, 2013. Saint Petersburg, Russia the platform. The study focuses in particular on warehousing (pallet handling and storage) and order picking activities. stored in the logistic services provider's warehouses. The processes selected concern the "Make-to-stock" category. 3.2 Stage 2.2: SCORCARD of level 1 performance metrics The "thread diagram" for the logistic services provider studied consists of the following SCOR processes (figure 1): - Plan P: planning of processes below; - Source stock product S1: receiving and storage; - Deliver Stock product D1 PF, Source stock product S1 PF: procurement of the stock reserved for order picking; - Deliver Stock product D1 PF 2: order picking; - Deliver Stock product D1: order picking of raw materials and packaging for factories. Stage 2 describes the preparation of a SCORCARD made up of 10 metrics. Out of these 10 metrics: only one (Perfect order fulfilment) is already used by the logistic services provider, and five are pertinent in terms of their application in a distribution warehouse (Order fulfilment Cycle time, SC management costs, Cost of goods sold, Return on fixed assets and Return on working capital). x x x x x x x x The "Perfect order fulfilment" metric is a contractual metric for the logistic services provider studied. The "Order fulfilment Cycle time" metric can be calculated. Its value is equivalent to one day: time between the booking of the trucking company and the departure of the loaded truck. This metric can be reduced to the "order fulfilment process time". This second metric represents the time between the beginning of the order picking process and the departure of the loaded truck. The time between these two metrics is not the responsibility of the logistic services provider. It depends on the anticipated booking of the trucking companies. There are daily and significant volume fluctuations which exceed 20% from one day to the next. The time frames (30 days) are too long because the orders must be processed within one day. Therefore the three metrics of the "agility" performance attribute proposed by the model are not applicable. Breaking down costs is possible thanks to the accurate warehouse's accounting system. 7KH ³6& PDQDJHPHQW FRVWV´ PHWULF FDQ EH FDOFXODWHG The "Cost of goods sold" metric is proposed by SCOR to evaluate the costs of the "Make" process only. This process is not involved in the practical case as the distribution warehouse has no production unit. This metric is pertinent for the warehouse because the payroll is one of the major costs. The warehouse does not have raw material costs. These costs are borne by the customer. The "Cash-to-cash Cycle time" metric is not applicable to the practical case platform as this platform does not manage its cash flow. Cash flow is managed by the logistic services provider's group. The distribution warehouses are informed of their fixed assets by the group's accounting department. The "return on fixed assets" metric is pertinent and can be calculated. It helps highlight the profit generated by the distribution warehouses, making it possible to maximise the return on their fixed assets. The distribution warehouses are in charge of their receivables. The "return on working capital" metric is pertinent and can be calculated. Fig. 1: "Thread diagram" for the logistic services provider only The second part of stage is the process diagram. There are 59 level 2 and 3 processes in total. 20 of these processes are used to map out the case studied. All level 2 processes have been divided into level 3 sub-processes. Development examples are set out below. The "Source stock product S1" process breaks down as follows (figure 2): - S1.2 a: Receive Product. In the model, this process corresponds with the reception activities. In the practical case, this process corresponds with the actions relating to the truck's arrival at the platform. - S1.1: Schedule product deliveries. In the model, this process corresponds with the planning and management of deliveries. In the case study, it corresponds with the creation of assignments for forklift truck operators and controllers via a software. Once the assignments have been created, they are sent to the portable terminals of forklift truck operators. - S1.2 b: Receive Product. In the case studied, this corresponds with the truck unloading activities of the forklift truck operator. - S1.3: Verify product. This process corresponds with product verification actions. The controller must ensure that the order matches the delivery slip in terms of quantity and product references. - S1.2c: Receive Product. In the practical case, this process corresponds with the actions relating to the truck's departure from the platform. - S1.4: Transfer Product. In the case studied, this process corresponds with pallet racking activities. 3.3 Stage 2.3: process "AS IS" Stage 3 describes the modelling of the process ("AS IS"). It begins with the working-out of the "thread diagram". The production of the logistic services provider's customer is based on sales forecasts, not orders. The products are then 426 2013 IFAC MIM June 19-21, 2013. Saint Petersburg, Russia Fig. 2.: stages 2.3 and 2.4: S1 Source stocked product x 3.4 Stage 2.4: level 2 and 3 performance metrics The final stage describes the implementation of metrics at levels 2 and 3 of the process. 52% of combined level 1, 2 and 3 metrics are applicable, and 27% of these applicable metrics are already used, at least in an equivalent form, by the logistic services provider studied. The metrics provided by the model are essentially cost and cycle time metrics. The "%Product Transferred without transaction errors" metric corresponds with the number of pallets put into stock in the wrong location. Erroneous storage results in a waste of time when the pallet is extracted later. 4. SCOR BENEFITS AND LIMITATIONS IN WAREHOUSING The section is divided into two parts. The first part describes the benefits of the SCOR model applied to warehousing. The second describes its limitations. For the S2 process, level 2, two cycle times are measured. The "order fulfilment cycle time" metric corresponds with the time spent by the truck at the dock. The time spent at the dock must be minimised to ensure that the driver spends most of his time driving. x The "Source cycle time" metric is the time between the truck's arrival and the storage of the products. Certain customers demand that products be rapidly placed in storage to monitor stock levels in real time. At level 3, process S1.2a: x The "%Orders/Lines Received On-time to demand requirement" metric corresponds with the percentage of trucks arrived on time. If transport deadlines are not complied with, the logistic services provider must manage and catch up lateness. Process S1.2b is evaluated by three metrics: x The "%Orders/Lines Received On-Time To demand Requirement" metric corresponds with the percentage of trucks unloaded within the deadline. It helps assess the unloading efficiency of forklift truck operators. x The value of the "costs" metric is essentially the working time of the forklift truck operator. x The "cycle time" metric indicates the truck unloading time. Process S1.3 corresponds with the control process. Two metrics are highlighted for this process: x The "%Orders/Lines received defect free" metric defines the number of pallets unloaded without any damage. x The "%Orders/Lines Received with Correct content" metric corresponds with the number of pallets with the correct references and quantity. Process S1.4 is evaluated using two metrics: x The "%Product Transferred On-time to demand requirement" metric corresponds with the transfer of the product into stock on time. 4.1 Benefits of SCOR in distribution warehouses x The accuracy of the SCOR model's definitions enables platforms to use a common language. This common language makes it possible to standardise the vocabulary. This language enables a benchmark between the customers of the platform, then between platforms of the logistic services provider. The provision of metrics and performance attributes helps decide which measurement to opt for. Performance attributes are essential characteristics of the performance for the logistic services provider. Performance attributes help classify the metrics which do not feature in the SCOR model but are used by the service provider studied. This classification differs from a classification by function or service. Classification by function does not provide a complete picture of the performance. Each service improves independently without considering the effect of its action on the performance of the overall system. The SCOR model provides metrics which evaluate the performance of the logistic services provider studied but also its customers. These metrics help highlight the sources of non-performance and the stakeholders responsible within the Supply Chain. Metrics are classified by level according to their location within the process. The location of these metrics within the modelled process provides an answer to the question of measurement location. The visual mapping of the SCOR model makes it possible to identify measurement points and, subsequently, the processes deemed ineffective. The SCOR model helps model the processes of the Supply Chain. The thread diagram helps identify the stakeholders of the Supply Chain and helps position the logistic services provider within its Supply Chain. Knowledge of these stakeholders helps determine the company's boundaries and 427 2013 IFAC MIM June 19-21, 2013. Saint Petersburg, Russia customer only. If the study is extended to the entire platform, the complete representation is difficult to achieve because of its size, making navigation through the entire system long and arduous. This navigation generates time cost overruns. the links between the different companies within the Supply Chain. Process modelling helps understand how warehouses operate and describe the actual state. This modelling helps identify the inputs and outputs of each process. It also helps observe the flows of materials and information through the processes. 50% of the metrics are not applicable. The logistic services provider provides companies with a service but does not own or manage the stock in the warehouse. Some "performance attributes" such as agility do not have a metric applicable to a distribution warehouse. Some processes are not evaluated. Certain processes only partly correspond with their constituent activities, in which case the metrics cannot evaluate their performance. Furthermore, during the successive use of the same process, the redundancy of the applicable metrics has been observed (for example, process S1.2 in the Source stocked product S1). The breakdown of the SCOR model into processes, associated metrics and levels provides a framework for performance evaluation. Classification by level and performance attributes makes it possible to follow the propagation of the metrics through the process. For example, costs are broken down level by level. This breakdown helps search for cost overrun causes in the process. The propagation gives a complete picture of the performance evaluation of the entire process. Once the SCOR model is in place, it is possible to simulate new scenarios. Performance evaluation distributed across the process helps highlight ineffective processes. Once these points have been detected, the changes to be implemented to achieve the determined performance objectives have still to be defined. The measurements of the "cycle time" metric often correspond with a change of unit compared with the estimated process cost. The most important cost is the payroll. The conversion of working time into monetary value corresponds with the cost metric. This results in metrics redundancy. Time measurements often depend on the volume processed. The volumes processed vary significantly. Therefore time measurements will vary. It is sometimes more pertinent to measure productivity so as to compare volume with time. Some metrics cannot be calculated as sources of information are lacking. To make the recommended calculations, the model must have the right sources of information. This calculation must not increase the model usage time. It must be automated. The incomplete evaluation of process performance means that the application of the model can no longer continue with the implementation of the "TO BE" state. Metrics redundancy generates cost overruns in terms of timeframe and monitoring of the metrics. 4.2 SCOR limitations in distribution warehouses Not all processes and sub-processes proposed by SCOR at level 3 are used for the practical case. The method recommends making choices according to the activities involved. The choice is made thanks to the definition of the model which describes the content of the processes. Certain activities involved may belong to different processes. Certain actions in distribution warehouses correspond with none of the processes proposed by SCOR. The incomplete modelling of the processes results in the unsatisfactory measurement of their performance. This means that users will not make full use of the model and will incur further delays in defining the modelling process. In the processes selected, 159 metrics are proposed. Monitoring all these metrics can be long and tedious. Each metric involves measurement, monitoring and the definition of action plans. Assistance in the identification of the most important metrics is required. This assistance will help reduce cost overruns in terms of time for the use of the model. SCOR proposes standard process names. Certain warehouse processes do not or only partly correspond with the SCOR process; therefore the names do not match the content of the process. Process names at level 3 are changed into terms which correspond with the company's culture. However, the following question can be asked: should the model adapt to the company or vice-versa? It is difficult to change the company's culture. Using a standardised language within the same company is essential. A poorly modelled activity or an activity with the wrong name results in a poor standard for the company and can lead to communication problems. The use of the SCOR standard makes it possible to communicate with other companies. This communication is however no longer possible if the vocabulary differs from that of the Supply Chain and the use of benchmarking is also no longer possible. Certain processes are not applicable to the case study. The stock in the warehouse does not belong to the logistic services provider. Thorough understanding of the model definitions is required to optimise the use of this model. Modelling via SCOR requires an in-depth understanding of how activities actually work and the completion of a field study. Acquiring and making use of the company's model is a long and tedious process. It generates additional costs and time. Computerisation is a key future development to make full use of the model acquired. 5. CONCLUSION AND PERSPECTIVES Business competitiveness is closely linked to business performance. The performance evaluation system is difficult to implement and various questions are raised concerning the choice or location of measurement, for example. The SCOR reference model provides answers to questions on performance evaluation in a Supply Chain. These questions have been addressed for distribution warehouses. This study relies on the practical application of the SCOR model to a The SCOR model provides no template for mapping out level 4. The method stipulates however that this is an important stage. This stage generates a cost overrun in terms of time for users who they must create their own templates. 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Computers and Electronics in Agriculture 73 p174±187. distribution warehouse. The distribution warehouse is modelled and the possibility of measuring its performance is examined. This study has highlighted the benefits of the SCOR model for evaluating the performance of distribution warehouses. SCOR provides a performance evaluation framework. This framework and the model's definitions provide a common language. Performance evaluation is based on a representation of the process which highlights measurement locations. This representation helps understand how the warehouse and related flows function. SCOR provides a vast number of metrics, classified by level and performance attribute. Metrics provide a choice of measurements for evaluating the performance of a warehouse and its customers. Performance attributes provide the key points of the warehouse's performance. This classification helps reveal how the metrics of the same performance attribute propagate. SCOR is recognised as a best practice for evaluating performance in a Supply Chain. The modelling provided by SCOR makes it possible to model out a current "AS IS" state. The "AS IS" state emphasises ineffective processes. This must help develop a future "TO BE" state. "TO BE" is a state of the process in which its operation, performance and control are improved [Supply Chain Council, 2008]. The development of the "AS IS" state for distribution warehouses is incomplete and does not make it possible to optimise the use of the model. The case study reveals the limitations of the model's application to distribution warehouses. The evaluation of the performance of certain processes and performance attributes is lacking. Monitoring a vast number of metrics is tedious; assistance in the selection of metrics or the definition of composite metrics is a research theme. A study on the computerisation of this model could be envisaged as its manual application is time consuming. Persson's research [Persson, 2009] addresses this issue. Other research themes would make it possible to improve the SCOR model applied distribution warehouses: developing a template for the representation of level 4, completing the evaluation of the performance of certain processes and performance attributes, and examining the correlation between the metrics of different performance attributes. REFERENCES Beamon B.M. (1999). Measuring supply chain performance, International Journal of Operations & Production Management 19 (3), p275±292. Bolstorff Peter, Robert Rosenbaum. Supply Chain Excellence. A handbook for dramatic improvement using the SCOR model. Edition Amacon. (2007). Chan F.T.S., H.J. Qi. (2003). An innovative performance measurement method for supply chain management, Supply Chain Management: An International Journal 8 (3±4) 209±223. Danish Irfan, Xu Xiaofei, and Deng Sheng Chun. July (2008). A SCOR Reference Model of the Supply Chain Management System in an Enterprise. 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