Bititci U S, “Modelling Performance Measurement Systems 1 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. MODELLING OF PERFORMANCE MEASUREMENT SYSTEMS IN MANUFACTURING ENTERPRISES Umit S Bititci Department of Design Manufacture and Engineering Management, University of Strathclyde, James Weir Building, 75 Montrose Street, Glasgow G1 1XJ Abstract In this paper the analysis, modelling and design of performance measurement systems is demonstrated through a case study example. The paper starts off with reviewing the current developments in the area of performance measurement. It then goes on to specify a set of requirements which future research on performance systems should address. The remainder of the paper summarises an attempt to modelling performance measurement systems using three views in a similar manner to that of information systems modelling techniques commonly used today. 1. Introduction Business Performance improvements arising from increased manufacturing integration continues to be one of the primary competitive issues of the 90’s. Recent research in to manufacturing systems integration [1] has identified the need for effective deployment of business objectives down through the organisation and the subsequent measurement of performance in critical areas as key elements of sustainable competitive advantage. The objective of the current research is to provide industry with a comprehensive and rigorous set of tools, techniques and procedures to allow auditing of existing performance measurement systems against a reference model and consequently design more robust , flexible and integrated performance measurement systems which could be used as a management tool by strategic, tactical and operational levels of management. This objective is being pursued through a collaborative research programme between the academic and industrial research partners at the Universities of Liverpool, Loughborough and Strathclyde. The deliverables of this research will provide manufacturing industry with an approach to auditing their performance measurement systems to ensure consistency and to provide reference models against which such performance measurement systems can be benchmarked and designed. The objective of this paper is to report the work carried out thus far at the University of Strathclyde with particular emphasis on the tools and techniques used for the analysis and modelling of performance measurement systems. 2. Background The hypothesis behind the research described in this paper was borne directly from the previous research aimed at developing integrating methods based on analysis of information, material flow and organisational systems [1]. This previous programme identified the value of Viable Systems Configurations Modelling [2, 3] as a frame work Bititci U S, “Modelling Performance Measurement Systems 2 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. for analysis of manufacturing integration and the benefits of using performance measurement to deploy business objectives and to pinpoint and monitor performance improvements. Other researchers have also noted the links between performance measures and strategic plans and/or critical success factors of the business. The research by Neely [4], Grady [5] and Eccles and Pyburn [6] supports the same conclusions drawn in the earlier research programme. In summary, the need for an integrated set of performance measures which support rather then contradict business objectives is now clearly established [7]. In addition, there is already considerable work being carried out by the accounting profession on performance measurement. Indeed, most manufacturing organisations have extensive performance measurement systems based on cost and financial accounting practices. However, because these techniques are often based on old fashion overhead absorption methods they fail to support the current business objectives and do not enable continuous improvement [8]. More recent innovations such as activity Based Costing improve allocation methods but still do not promote continuous improvement and strategic orientation. Notable work has been carried out by Kaplan [9, 10] and Johnson [11] in recognition of these weaknesses. Neely [12] summarises the short comings of the current accounting practices with respect to performance measurement in manufacturing enterprises. Because , financial measures that are currently in place are not supporting the change process, there is a case for new styles of measurement systems that are appropriate to the needs of the modern manufacturing industry. Green [13], McNair et al [14,15], Druker [16], Russell [17] and Kaplan [9] show that there is a need for alignment of financial and non-financial measures that fit within a strategic framework. Furthermore, based on research carried out by Bititci [18], Blenkinsop and Burns [19] and Gelders et al [20] there is evidence that, even in companies where quality oriented performance measures are employed, these are still being use in a manner which does not promote integration. There has been several cases cited where the company’s strategy, improvement projects and performance measures were in conflict. Research by Yoshikawa et al [21] and Sakurai [22] illustrate that the Japanese research shows a significant difference from the Western research, rather than emphasis on performance measurement which tends to reinforce an “as-is” view, they tend to put greater stress on “targets” and the measurement of the gap from the targets to facilitate continuous improvement. 3. The Future In the context of the above discussion future research on performance measurement systems must place emphasis on the following points: Performance measurement systems must be researched in a holistic context applying to all aspects of a manufacturing business in order to avoid sub optimisation. Bititci U S, “Modelling Performance Measurement Systems 3 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. Performance measurement systems must provide a vehicle for deploying business objectives and strategies through all levels of the organisation to maximise integration. Performance measurement systems must facilitate continuous improvement in line with the strategic objectives of the business. Performance measurement systems should facilitate understanding of the structures and relationships between various measures and promote conscious management of inevitable conflicts. The traditional accounting based performance measures and the non-financial performance measures should not be mutually exclusive but should be integrated under one system of performance measures. Performance measurement system design should consider information systems capabilities to provide the necessary level of data in terms of accuracy and reliability, Kehoe et al [23]. Performance measurement systems design should consider the organisational, behavioural and cultural aspects of the organisation concerned. Some background work on this area has been carried out by Rotter [24]. 4. Analysis and Modelling Techniques The performance measurement system within an organisation, with respect to its structure and complexity, may be considered to be similar to an information system because: An information systems consists of a number of data items, similarly the a performance measurement system consists of individual performance measures. In an information system the individual data items are usually organised in the form of a hierarchy, similarly the individual measures within a performance measurement system are also structured in the form of a hierarchy corresponding to strategic, tactical and operational aspects of the business. In an information systems the data items may have simplex or complex relationships, that is if one data item changes this may cause changes in one or more data items elsewhere in the information system. This type of simplex or complex relationships also exist between the individual measures within a performance measurement system, i.e. an improvement in one measure may lead to changes (improvement or deterioration) in one or more of the measures within the performance measurement. In an information system the dynamic (i.e. time dependent) behaviour of the data items are influenced by the underlying data processing process. Similarly, in a performance measurement system the dynamic behaviour of the individual performance measures are influenced by the underlying business process. Bititci U S, “Modelling Performance Measurement Systems 4 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. Information systems analysis and design techniques model a information system from three viewpoints [25]. These are: Process view - Modelling of the data process Data view - Modelling of the data structures Control view - Modelling of the data dynamics When these three views are fully developed , defined and consolidated they provide a complete analysis of the system. Any information system may be analysed in this fashion to show the “system’s footprint”. The system’s footprint, shown in Figure 1, represents the characteristics in terms of complexity of data relationships, data dynamics and data processing, where the each of the axis denote increasing complexity for each of three views. Control View (Data Dynamics) Process View (Data Process) Data View (Data Structures) Figure 1. System’s foot print for information systems model. The hypothesis of the work presented in this paper was that, since the performance measurement systems exhibit similar characteristics to that of information systems they also could be modelled using techniques similar to that used for information systems analysis and modelling. This approach will result in the development of the same three views for the performance measurement system, also resulting in a system’s footprint as shown in Figure 2. Control View (PMS Dynamics) Data View (PMS Structure) Process View (PMS Process) Bititci U S, “Modelling Performance Measurement Systems 5 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. Figure 2. System’s footprint for performance measurement systems model. 5. Modelling Performance Measurement Systems In order to assess the validity of the hypothesis an attempt was made to model the performance measurement system using real life data from a collaborating manufacturing organisation. The case study company is a Scottish based subsidiary (cost centre) of a major multinational specialising in the production, bottling, packaging and world-wide distribution of white and brown spirits. In this section the analysis methodology employed is described together with the techniques used to model each one of the three views of the performance measurement system. In summary the analysis methodology followed the following steps: Identification of strategic performance measures. Development of process models. Development of the structure models. Development of the control model. 5.1. Identification of Strategic Performance Measures In order to identify the strategic measures of performance the simple total quality concept of customer - supplier relationship was employed. The business as a whole was treated as a single process and its key customers and their requirements were identified. At this point it must be reminded that customers are not limited to those organizations or individuals who purchase the business’s products and/or services, they most certainly include employees, shareholders, government agencies and so on, i.e. stakeholders (Druker 1990). To remain competitive and meet its business objectives the business must recognize its diverse range of customers and meet their requirements. Therefore the next step in the process was the identification of the customers requirements. For example the parent company's requirements may be, return on investment, recovery rates, profitability, etc. The commercial customers requirements may be quality, delivery and price oriented and the employees requirements may be security, job satisfaction, career progress, and so on. Having defined the requirements of each customer the next step was the identification of measures which would provide objective information on the businesses ability to meet its customers requirements. During this process there was certain amount of rationalization in order to prevent the non strategic performance measures being represented at the strategic level. In practice three main customers and their requirements were focused upon. These being: The commercial customers The employees of the company The parent company / the shareholders Bititci U S, “Modelling Performance Measurement Systems 6 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. Rationalization of the results at this level constituted the basis of the strategic performance measures for the case study company . Table 1 presents a summary of key points of this process. CUSTOMER STAKEHOLDER Commercial Customers Employees Parent company/ Shareholders REQUIREMENTS Product quality Delivery reliability Value for money Product Image Job Satisfaction Security Fair remuneration Development / Investment Progression MEASURE % Orders shipped on time % Orders shipped with alterations Number of complaints Average response time to complaints New projects delivered on time New project lead-times Customer satisfaction index Employee satisfaction index Cashflow - Actual v Plan Cost effective operations Cost of production per case Effective financial produced management Cost of production per case sold Table 1. Strategic Performance Measures 5.2 Development of the Process Model In this case the process model represents the underlying process which leads to achievement of the strategic objective. It was decided to use Data-Flow-Diagramming (DFD) technique to model the underlying process. Although it was possible to create a single DFD model to encapsulate all activities which effect all the strategic performance measures, it was simpler to create a DFD model of the process focusing on one measure at a time. This resulted in considerable duplication between the models but it also simplified the model making it more visible. Therefore, in this case study it has been necessary to create a process model for each one of the strategic performance measures identified. In this paper for illustration purposes the strategic measure “% Orders Shipped On Time” has been selected for illustration purposes. Figure 3 shows the process model developed for this particular strategic performance measure. Bititci U S, “Modelling Performance Measurement Systems 7 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. Third Party Warehouses Quality Control Test Wet Goods Wet Goods Spirit Processing Warehousing Receipts for Consolidation Problem Documentation Shipping, DOP, Stock Control Bottling, Palletising Documentation Documentation Dry Goods Dry Goods External Supplier BOM, Materials Short-Term Orders BOM Product Product Customer Invoice Order Order Customer Services Order, Complaints Planning, Procurement Purchasing Long-Term Orders Demand Figure 3. The process model for “% Orders Shipped On Time”. 5.3 Development of the Structure Model The development of the structure model follows on from the process model. Having created a process model for the performance measure in question, in this step the activities within each process were analysed in order to establish factors which may contribute towards the particular performance measure. This was achieved through the use of Cause-and-Effect analysis as shown in Figure 4. The Cause-and-Effect analysis show how each process (shown as a major cause) may have an impact on the performance measure. For example, the Bottling and Palletising process can effect the performance of the organisation with respect to “% Orders Shipped on Time” by its ability to fulfil the plan, i.e. Bottling Plan Hit Rate. In turn the factors listed on the downward arrow, such as quality, breakdowns, bottling plan accuracy, material supply, etc. can constrain the Bottling and Palletising Process’s ability to fulfil the plan. The Cause-and-Effect diagram as shown in Figure 4. Provides the structure view for that particular performance measure. In addition it also leads to the identification of performance measures for use at the tactical and operational levels. The measured identified against each process, e.g. Bottling Plan Hit Rate, Order Processing Lead Time, Vatting Hit Rate, Accuracy of Bottling Plans, etc. are considered to be tactical performance measures corresponding to each process. The causes listed under each process provides the basis for operational measures for that process, i.e. in the case of Bititci U S, “Modelling Performance Measurement Systems 8 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. the Bottling and Palletising process operational measures consists of measures such as downtime, material supply delays, labour shortage, etc. External Planning, Procurement Bottling, Palletising Accurate+Realistic Plans Bottling Plan Hit Rate Purchasing Materials Ordered on Time/in Correct Quantity Line Choice Transportation& Shipping Delays Orders not Made Bookable Unrealistic Line Planning Material Supply Material Supply Availability of Blend Specification Late Liquid Receipts Transportation Problems Spirit Quality Labour Supply/ Capacity Breakdowns Absence of Daily Priorities Labour Supply& Line Skills Capacity Spirit Accuracy of Planning Data Supply Systems Availability Material Supply Bottling Plan % Orders not Shipped on Time Loss&Damage in Store Spirit Quality and Strength Documentation External Warehouses Spirit Availability Orders not Made Bookable Inventory Accuracy Lack of Capacity Product Knowledge Data Availability Quality Availability of Planning Data Material Supply Planning& Cost Data Changes to Blend Program Picking Accuracy Data Accuracy Material Availability Product Mix Forecast Accuracy Flexibility Capacity Loading Plan Inaccurate Orders Loading Priorities Stock Record Accuracy Failure to Book Ship Blend Hit Rate Data Accuracy, Timeliness Vatting Hit Rate Order Processing Lead Time Warehousing BOM, Materials Spirit Processing Shipping, DOP, Stock Control Transport Availability Figure 4. Cause-and-Effect Diagram providing the Structure view. The use of the Cause-and-Effect analysis technique as described above provides a useful approach to analysis and provides some form of guidance for modelling of the structure of performance measures. It is possible to transpose the information contained in the Cause-and-Effect diagram in to a more traditional structure chart commonly used in information systems analysis. Figure 5 illustrates a traditional structure chart which corresponds to the Cause-and-Effect diagram shown in Figure 4. % orders shipped on time Warehousing Shipping, DOP Stock Control Blending plan hit rate Order Proc. lead time Stock Record External Warehouses Accuracy Transport availability Loading Plan BOM Materials Loading Process Loading plan Hit rate Capacity Planning Procurement Planning data Bottling and Palletising Spirit Processing Bottling plan hit rate Vatting Hit Rate Purchasing External Material Supply Material Supply Planning and cost data Accuracy Supply problems Supply problems Accuracy Priorities BOM Materials BOM Materials BOM Materials Bititci U S, “Modelling Performance Measurement Systems 9 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. Figure 5. Traditional structure chart. 5.4 Development of the Control Model The control view is a model of the interactions between states and events of a real-time system. The system responds to outside events and passes through a series of modes or states. As events occur, they initiate changes in the system’s state. In software engineering State Transition Diagrams (STD) are used to model the control view of a system. Several attempts were made to create the control view of the performance measures employing STD’s. But the only way of using an STD seems to be to describe the control view of processes of an organisation. Figure 6 illustrates this on an example. Using the STD as shown in Figure 6 can help to identify performance measures on the functional level. It is displayed how failures could have an influence on the strategic measures. In the example two failures can occur which affect the strategic measure “% Orders Shipped on Time”. The first one is a failure in Bottling and Palletising which leads to rework. Looking at this problem, a useful measure could be “% of Orders with Bottling and Palletising Failures” or “Bottling Plan Hit Rate”. The other failure is that there is no transportation available or not available for all goods. Therefore a second measure could be “% of Orders with Transportation Problems”. To create an STD which can be used to develop performance measures, it is necessary to have a very good knowledge and understanding of the organisation’s operations, processes and procedures. Without this, a sound STD cannot be developed. Creating an STD was found to be a very time-consuming and difficult task. However, once it is completed it could be a helpful means of identifying functional performance measures. A possibility of creating the control view, which means to display how the measures are influencing each other, is the use of a Quality Function Deployment (QFD) oriented approach using a matrix diagram. Figure 7 illustrates how a QFD oriented matrix could be employed. In the vertical column the influencing measures are written, perpendicular to them the influenced measures. The levels are chosen according to the levels in the structure view. In the matrix the level of relationship between individual measures are illustrated in the normal QFD fashion. That is: ++ + Blank -- Strong positive impact Positive impact No impact Negative impact Strong negative impact For example, if the functional measure “Order Processing lead-time” improves, i.e., the lead-time becomes shorter, this influences the strategic measure “% Orders Shipped on Time” in a strong positive way. Bititci U S, “Modelling Performance Measurement Systems 10 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. This QFD oriented matrix approach provides a valuable technique to describe the dynamic view of a performance measurement system, because it is simple and straightforward to understand. Reworking Goods C: Failure in Bottling & Palletising A: Rework Bottling & Palletising C: Bottling & Palletising Finished Goods to Be Despatched Later C: Bottling & Palletising Finished Goods to Be Despatched Soon A: Bring Goods to Cased Goods Stock A: Bring Goods to Despatch Hall Goods in Cased Goods Stock C: Goods Needed for Order A: Bring Goods to Despatch Hall Goods Awaiting Despatch C: Transportation not Available (for All Goods) C: Transportation Available A: Load Goods According to Loading Plan A: Waiting Despatching Goods C: Despatch Finished A: Set Status “Despatch” to 1 Give Despatch “Information” to Shipping Department Shipping Goods C: Shipping Finished A: Send “Bill of Lading” to Shipping Department Figure 6. State Transition Diagram for controlling the despatch process. Loading Plan Hit Rate 3. LEVEL Not Made Bookable Order Processing Lead-Time 2. LEVEL 3 % Orders Shipped without Alterations % Orders Shipped with Correct Quantity 5 % Orders Shipped on Time INFLUENCING MEASURE 1. LEVEL INFLUENCED MEASURE Bititci U S, “Modelling Performance Measurement Systems 11 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. 1. LEVEL % Orders Shipped on Time % Orders Shipped with Correct Quantity % Orders Shipped without Alterations 2. LEVEL Order Processing Lead-Time Not Made Bookable ++ ++ 3. LEVEL Loading Plan Hit Rate + + 39 30 ++ Figure 7. Control View using a matrix (not complete). The use of the QFD approach also promotes deployment of priorities. between various levels of the performance measurement system. Once the business objectives and strategy is established this will allow prioritisation of the strategic performance measures according to the these objectives and the strategy. Once the top level priorities are in place these could be deployed to lower levels through the relationship matrix using the relationship level as an deployment aid. This type of deployment approach is well described in the widely available QFD material. For example, a strong relationship may be rated “6” and a weak relationship may be rated “3”. In this case if the strategic measures “% orders shipped on time” and “% orders shipped with no alterations” have been prioritised as being “5” and “3” consecutively, then these priorities may be deployed to the next level where the tactical measure “order processing lead time” has a strong relationship with “% orders shipped on time and a weak relationship with the measure “% orders shipped without alterations”. This will be achieved as follows:Priority = (5*6)+(3*3) = 39 However, in using this approach one must practice particular attention to ensure that priority deployment is carried out between two distinct levels. In the example shown in Figure 7 the priority deployment is carried out from level 1 to level 2, i.e. from the Bititci U S, “Modelling Performance Measurement Systems 12 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. strategic level to the tactical level. Failure to follow this simple rule may lead distortion of priorities. 6. Discussion and Conclusions This paper started off with reviewing the current developments in the area of performance measurement. It then went on to specify a set of requirements which future research on performance systems should address. The remainder of the paper summarised an attempt to modelling performance measurement systems using three views in a similar manner to that of information systems modelling techniques commonly used today. It is the conclusion of the researchers that the value of this method of modelling is in the method, i.e. creation of the three views, rather then in the particular tools and techniques used. Figure 8 summarises the tools and techniques used to create the particular view in this instance, it also identifies alternative methods which could be used to develop the particular view. However, it does not offer any comments or guidance on the suitability and robustness of the alternative approaches. Control View (PMS Dynamics) • QFD Matrix • State Transition Digrams • Entity Relationship diagrams Data View (PMS Structures) • Structre Diagrams • Cause and Effect Diagrams Process View (PMS Process) • Data Flow Diagrams • IDEF 0,1, etc. Figure 8. Tools and Techniques used to create the three views. (Alternative techniques are shown in italics) The approach to modelling as described in this paper goes some way towards fulfilling the requirements expressed earlier in section three. This is achieved by: Considering all customers of the business as explained in section 5.1 leads to an holistic approach to the modelling of performance measurement systems. This approach includes financial and non-financial measures. Bititci U S, “Modelling Performance Measurement Systems 13 in Manufacturing Enterprises”, International Journal of Production Economics, vol. 42, April 1996, ISSN 0925-5273, pp 137-147. The structure view itself may be considered to be over complex and too detailed. But the prioritisation and deployment techniques of the QFD based control view illustrates how these could be narrowed down to identify the few critical measures. This approach also ensures that operational processes are aligned to the operations/manufacturing strategies. The QFD matrix oriented approach allows deployment of business objectives and strategies through various levels of an organisation, thus promoting more structured approach to continuous improvement programmes. The QFD matrix together with the structure view facilitates understanding of the relationships between various measures thus maximising integration and promotes conscious management of conflicts. However, this approach in analysing and modelling mechanistic aspects of performance measurement systems, fails to take in to account the information systems capabilities to support the system ant the softer organisational, behavioural and cultural issues associated with performance measurement systems. In summary, it may be concluded that modelling performance measurement systems in this fashion is a worthwhile exercise as it not only models the performance measures currently used within the organisation, it also facilitates the identification and design of a robust and integrated performance measurement system. 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