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Implementation of lean manufacturing techniques in the bakery industry in Medellin

Implementação de técnicas de fabricação lean na indústria de panificação em Medellín

Abstract

The bakery industry has great economic and social importance in the city of Medellin; most of the companies are small with high levels of informality, low value added and productivity. Lean Manufacturing has become one of the most popular paradigms of waste disposal in the industrial sector and services, with great benefits of their practice on the improvement of the quality and organizational productivity. This work evaluates the level of implementation of the lean manufacturing techniques in the micro and small enterprises in Medellin, in the food sector. It was using diagnostic and follow-up tools with questionnaire to the production chief, which include 9 techniques or tools, and a variable of administration that allow organizations to a guide, to improve the current conditions of productivity. The main results show that the outstanding Lean practices are: PokaYoke, Kaizen and visual factory. However, for which the sector is considered to be of world class, the practices must be strengthened: VSM (generation of value), JIT (Production Flow) and ADMON (Administration). In addition, organizations must increase sales least 139, 20% to increase the level of efficiency of the sector, without changing the number of employees.

Keywords:
Bakery; Lean Manufacturing; Improving; Productivity

Resumo

A indústria de panificação tem grande importância econômica e social na cidade de Medellín. A maioria das empresas é pequena, com altos níveis de informalidade, baixo valor agregado e produtividade. O Lean Manufacturing tornou-se um dos mais populares paradigmas de disposição de resíduos no setor industrial e de serviços, com grandes benefícios de sua prática para a melhoria da qualidade e da produtividade organizacional. Este trabalho avalia o nível de implementação das técnicas de manufatura enxuta nas micro e pequenas empresas de Medellín, no setor de alimentos. Para tanto, são empregadas ferramentas de diagnóstico e acompanhamento com questionário para o chefe de produção, que incluem nove técnicas e uma variável de administração que permite às organizações um guia para melhorar as condições atuais de produtividade. Os principais resultados mostram que as excelentes práticas Lean são: Poka Yoke, Kaizen e fábrica visual. No entanto, para que o setor seja considerado de classe mundial, deve-se fortalecer as práticas VSM (geração de valor), JIT (fluxo de produção) e ADMON (administração). Além disso, para aumentar o nível de eficiência do setor, as organizações precisam aumentar as vendas em, pelo menos, 139, 20%, sem alterar o número de funcionários.

Palavras-chave:
Padaria; Lean Manufacturing; Melhoria; Produtividade

1 Introduction

Small and medium companies (smes) are a fundamental component in the Latin America industry, their importance is presented in different ways in different countries in the region, and this importance is related with the number of companies and the job creation and the product they manufacture (Sosa, 2014Sosa, M. L. B. (2014). Las micro, pequeñas y medianas empresas en el ámbito del desarrollo en América Latina. Temas de Economía Mundial. 26, 83-98.). In Colombia the smes correspond to the 98.7% of the registered companies y the chamber of commerce.

In Latin America and Europe, the smes represent the 30% and 60% of the (GDP) respectively but still exits a great gap between the productivity in smes in Europe and latin America, the average participation in exportations is just 5% of the smes in Latin America. And if they cannot resolve this gap and improve their processes, managerial techniques, technology, the gap will persist in time.

Food and beverages industry represents in Colombia more than 20% of the total industry and the bakery industry in Antioquia which Medellin is the capital, place where the study was done, exists 806 bakery companies, and from this number 797 are smes (98%) (Medellín Chamber of Commerce, 2014aMedellín Chamber of Commerce. (2014a). Estadísticas Cámara. Estructura empresarial por actividad económica. Centro de Servicios. Retrieved in 2014, July 7, from http://www.camaramedellin.com.co/site/Servicios-Empresariales/Informacion-Empresarial/EstadisticasCamara.aspx
http://www.camaramedellin.com.co/site/Se...
, bMedellín Chamber of Commerce. (2014b). Desempeño de la economía de Antioquia 2014/2015. Retrieved in 2014, July 17, from http://www.camaramedellin.com.co/site/Portals/0/Documentos/RUEDA%20DE%20PRENSA%20-%20MARZO%203%20DE%202015%20-%20Coyuntura.pdf
http://www.camaramedellin.com.co/site/Po...
).

This type of companies, smes, have as a competitive advantage their close location to customers and a very wide products portfolio. The traditional products are. Sweet bread, pastry products, light bread, and many of them offer cafeteria services.

One of the improvement technique is Lean Manufacturing and this is based on continuous reduction of waste and increasing the quality of the products. Looking for more productivity, best quality, less time spent, less money invested, to obtain more revenues (Theuer et al., 2013Theuer, H., Gronau, N., & Lass, S. (2013). The impact of autonomy on an manufacturing systems. In A. Azevedo (Eds.). Advances in Sustainable and Competitive Manufacturing Systems (pp. 1413-1423). Heidelberg: Springer. Lecture Notes in Mechanical Engineering.; Holtskog, 2014Holtskog, H. (2014). Continuous improvement beyond the lean undertanding. Retrieved in 2014, June 7, from http://www.researchgate.net/profile/Halvor_Holtskog/publication/257745933_Continuous_Improvement_Beyond_the_Lean_Understanding/links/0046353a8486f5ac7d000000.pdf
http://www.researchgate.net/profile/Halv...
).

The implementation of Lean Manufacturing in this industrial sector has many challenges and difficulties, this is due the low level of implementation of the continuous improvement culture in the smes and the lack of time to do this project (Jain & Lyons, 2009Jain, R., & Lyons, A. C. (2009). He implementation of lean manufacturing in the UK food and drink industry. International Journal of Services and Operations Management. 5(4), 548-573. https://doi.org/10.1504/IJSOM.2009.024584.
https://doi.org/10.1504/IJSOM.2009.02458...
; Rasli et al., 2013Rasli, M., Yusof, S., & Zainal, A. (2013). A case study of lean manufacturing implementation approach in Malaysian automotive components manufacturer, electrical engineering and intellingent systems (Electrical Engineering and Intelligent Systems, pp. 327-335). New York: Springer.).

In the food industry, the key factor to implement Lean techniques is the managerial commitment and leadership and economical support, the application of these techniques in the industry is beginning and due to the consumers and competitors pressure (Dora et al., 2013Dora, M., Kumar, M., van Goubergen, D., Molnar, A., & Gellynck, X. (2013). Operational perfomance and critical success factors of lean manufacturing in European food processing SMEs. Trends in Food Science & Technology. 31(2), 156-164. https://doi.org/10.1016/j.tifs.2013.03.002.
https://doi.org/10.1016/j.tifs.2013.03.0...
).

The objective of this work is to evaluate the implementation of continuous improvement actions related with Lean as. Poka Yoke systems, Smed, TPm, 5`s, kaizen, just in time systems, visual factory, six sigma; in the small and medium bakery enterprises in Medellin. Using a diagnosis tool such a questionnaire and the support of DEA analysis to evaluate improvement actions, looking for a rise in the productivity levels.

The DEA, (data envelopment analysis) is a non-parametric technique which has the following characteristics. Standardization, takin in account multiple inputs and outputs, and liner programming algorithms to evaluate two processes at the same time. (the efficient border and the inefficiency estimation). The first process, can be obtained form to sources, according the orientation chosen, Input or Output. If the input is chosen, its level is maximized and the output level remains constant, in the contrary if the output is maximized, the level of input remains constant. The second process, inefficiency estimation, depends on the orientation used, and this is calculated according with the distance to the border in each evaluated company.

2 Theoric background

Lean manufacturing, is a conceptual frame very well known in many industrial companies since the beginning of 90`s, lean could be better explained as the elimination of waste, or non value activities, those are one of the lean manufacturing field of work (Womack & Jones, 1994Womack, J., & Jones, D. T. (1994). From lean production to the lean enterprise. Harvard Business Review, 72, 93-104.; Womack & Jones, 1996Womack, J. P., & Jones, D. T. (1996). Lean thinking: banish waste and create wealth in your corporation. New York: Simon and Schuster.).

In Lean Manufacturing the change is supported in the culture, is more a managerial activity (Csokasy & Parent, 2007Csokasy, D. L., & Parent, P. D. (2007). Managing lean manufacturing. Dearborn, MI: Society of Manufacturing Engineers.). Lean is a sociotechnical system (Raja, 2011Raja, M. (2011). Lean manufacturing - an integrated socio-technical systems approach to work design[thesis].Retrieved in 2014, July 3, fromhttps://tigerprints.clemson.edu/all_dissertations/720
https://tigerprints.clemson.edu/all_diss...
). Lean production is seen as a philosophy who cares about technical and cultural aspects (Bhasin & Burcher, 2006Bhasin, S., & Burcher, P. (2006). Lean viewed as a philosophy. Journal of Manufacturing Technology Management, 17(1), 57-72. http://dx.doi.org/10.1108/17410380610639506.
http://dx.doi.org/10.1108/17410380610639...
). Bayou & Korvin (2014)Bayou, M. E., & Korvin, A. (2014). Measuring the leanness of manufacturing systems: a case study of Ford Motor Company and General Motors. Retrieved in 2014, June 17, from http://www.sciencedirect.com/science/article/pii/S0923474808000453
http://www.sciencedirect.com/science/art...
recognize that Lean manufacturing is an strategy to invest less in the inputs and getting best production and product quality at the outputs including post sale services and customer relationships. For Toyota the use of Lean techniques has been and objective in their factories (Holweg, 2007Holweg, M. (2007). The genealogy of lean production. Journal of Operations Management, 25(2), 420-437. http://dx.doi.org/10.1016/j.jom.2006.04.001.
http://dx.doi.org/10.1016/j.jom.2006.04....
; Martínez & Moyano, 2013Martínez, P., & Moyano, J. (2013). Lean management, la gestión de la cadena de suministro y la sostenibilidad: una revisión de la literatura. Retrieved in 2014, June 17, from http://www.sciencedirect.com/science/article/pii/S0959652613006550
http://www.sciencedirect.com/science/art...
).

2.1 Lean Manufacturing in small and medium enterprises (smes)

The research conducted by Zhou (2016)Zhou, B. (2016). Lean principles, practices, and impacts: a study on small and medium-sized enterprises (SMEs). Annals of Operations Research, 241(1-2), 457-474., found that the factors affecting the implementation processes are the following.

  • -Philosophy concepts understanding;

  • -state of implementation;

  • -People`s perception of the process;

  • -advantages and benefits of the implementation processes;

  • -implementation difficulties.

This study presents a better way to understand Lean strategies and techniques and the way they could be used in the companies. An evaluation mechanism could be implemented top show the evolution of the improvements presented in the companies (Walter & Tubino, 2013Walter, O. M. F. C., & Tubino, D. F. (2013). Métodos de avaliação da implantação da manufactura enxunta: uma revisão da literatura e classificação. Gestão & Produção. 20(1), 23-45. http://dx.doi.org/10.1590/S0104-530X2013000100003.
http://dx.doi.org/10.1590/S0104-530X2013...
).

2.2 Lean in the food industry

European food smes, according with Dora et al. (2013)Dora, M., Kumar, M., van Goubergen, D., Molnar, A., & Gellynck, X. (2013). Operational perfomance and critical success factors of lean manufacturing in European food processing SMEs. Trends in Food Science & Technology. 31(2), 156-164. https://doi.org/10.1016/j.tifs.2013.03.002.
https://doi.org/10.1016/j.tifs.2013.03.0...
present a good experience in the implementation of Lean Manufacturing techniques, with an incremental tendency due to the competition and customer demand. But studies have shown a low impact due the singularities of the sector. The row materials, the demand so stationery, harvest variety, the complex and complicated supply chain, suppliers and buyers net and the warehousing activities affect in a big way the motivation to implement Lean in smes companies.

In Colombia a research conducted by Arrieta et al. (2011)Arrieta, J., Muñoz, J., & Salcedo, A. (2011). Aplicación Lean Manufacturing en la industria colombiana. Retrieved in 2014, July 21, from http://www.laccei.org/LACCEI2011-Medellin/RefereedPapers/PE298_Arrieta.pdf
http://www.laccei.org/LACCEI2011-Medelli...
found that the industrial sectors with most implementation processes were 21% automation, 20% metalmechanical industry, 16% food industry. And the industrial sector with the lowest level of implementation was, textile industry and ceramic and glass.

3 Methodology

A questionnaire was developed and implemented with the operations manager or similar in 86 smes companies, from a total of 767 companies registered in the chamber of commerce in Medellìn.

The questionnaire evaluated 10 variables with 55 questions. The variables were, Poka yoke systems, zero defects, TPM, kaizen, visual Factory, Smed, value stream mapping, 5s`s, statistical processes control, Just in time. (De Diego et al., 2009De Diego, A. T., Sierra, N. M., & García, S. J. (2009). The Toyota way. Lean, more than a kit of tools and techniques. Cuadernos de Gestión, 9(2), 111-122.).

It is proposed to work with paper published by Wahab et al. (2013) Wahab, A. N., Mukhtar, M., & Sulaiman, R. (2013). Conceptual model of lean manufacturing dimensions. Procedia Technology. 11(2013), 1292-1298. http://dx.doi.org/10.1016/j.protcy.2013.12.327.
http://dx.doi.org/10.1016/j.protcy.2013....
titled. “a conceptual model of lean manufacturing dimensions” and the Zhang & Niu article (Zhang & Niu, 2013Zhang, H., & Niu, Z. (2013). Influence mechanism of lean production to manufacturing enterprises competitiveness. In: Proceedings of the 19th International Conference on Industrial Engineering and Engineering Management (pp. 805-813). Berlin Heidelberg: Springer. http://dx.doi.org/10.1007/978-3-642-38391-5_85.
http://dx.doi.org/10.1007/978-3-642-3839...
) “Influence mechanism of Lean Production to manufacturing enterprises competitiveness”.

The population was taken according with information from the chamber of commerce of Medellin, including the food industry, especially bakery ones. Showing a result of 797 companies registered. The sample was 86 companies, to get this number the Spigel and Stephens formula (Spiegel & Stephens, 2001Spiegel, M., & Stephens, L. (2001). Estadística. México: Mc Graw Hill/Interamericana de Editores.) was used. With an error of 5%, a p= 0.5, assuming, 50% of the population use lean techniques. This questionnaire was validated in 5 cafeterias.

The data analysis was done using a Likert scale with an evaluation of 1, 3, 5 d a PF, (positioning factor) with a range of -100% and 100% using stat graphics.

The questionnaire scale is presented as follows.

  1. 5

    Implementation of the Lean technique in the 80-100% of the processes or areas in the Company

    1. 3

      Implementation of the Lean technique, in the 50-79% of the processes or areas in the Company

      1. 1

        Implementation of the Lean technique, in the 0-49% of the processes or areas in the Company.

The positioning factor is evaluated according with the following Formula 1, defined by Marín (2000)Marín, R. (2000). Almacén de Clase Mundial (198 p.). Medellín, Colombia: Editorial Universidad Pontificia Bolivariana..

F P = 1 * No . questions = 5 + 0,5 * N o . q u e s t i o n s = 3 1 * N o . q u e s t i o n s = 1 T o t a l N o . q u e s t i o n s (1)

This classification permits locate the companies in 4 quadrants or sectors. Seibel (2004)Seibel, S. (2004). Desarrollo de un modelo de benchmarking basado en un sistema productivo de clase mundial para evaluación de prácticas y desempeño de la industria exportadora brasilera [tesis doctoral en ingeniería]. Florianópolis: Universidad Federal de Santa Catarina. and Arrieta et al (2011)Arrieta, J., Muñoz, J., & Salcedo, A. (2011). Aplicación Lean Manufacturing en la industria colombiana. Retrieved in 2014, July 21, from http://www.laccei.org/LACCEI2011-Medellin/RefereedPapers/PE298_Arrieta.pdf
http://www.laccei.org/LACCEI2011-Medelli...
. Sector I. Productive organizations, sector II. Basics organizations, sector III. Vulnerable including delays organizations, and sector IV. Promisories organizations. (The X axis, development of lean practice (calificación o desarrollo de la practica lean, the Y axis positioning factor)

Quadrant I. Productives. If a Company is located in this sector, has in the development of lean practices and positioning factor a grade of 3.0 and percentages above 60% (the minimal values expected) the companies located in world class companies (clase mundial) have a qualification above 80%, that means they have an operational excellence and have very good capabilities to compete in international markets.

Quadrant II. Basics. If a Company is located in this sector has a positioning factor between 60 and 100% and a development of lean practices between 1 and 3. In these cases, it is important to notice the low level of strength in the implementation of continuous improvement techniques.

Quadrant III. Vulnerables. If a Company is located in this sector present a percentage 60% or less and 3.0 in Lean practices development. This kind of companies has implemented some improvement techniques. in this quadrant are located too, the delay companies (rezagadas), those are the ones with values between -80% and 0. They have to invest strongly in improvements.

Quadrant IV. Promissories. If a Company is located in this sector, present a grade above 3.0 in the lean development techniques and has a positioning factor under 60%. The minimum desired level. This means the Company is working in improvement actions and their results are not good enough. In Figure 1. the different quadrants are shown.

Figure 1
Organizational quadrants. Source: Authors. Explanatory note: N.A. means “Does not apply”.

In addition to the questionnaire, a group of question was applied to the managers, looking for this information, type of company, number of workers, education level, type of layout, quality procedures, technology associated to the production process, training level of the employees and their ability to find waste and mistakes in the process, and weekly sales.

With this information, each Company was analyzed, and located in their respective quadrant. Improvement actions are presented and the DEA analysis give more information about what are the road to follow.

According with the problems in the smes, the BCC model was chosen (Banker et al., 1984Banker, R. D., Charnes, A., & Cooper, W. W. (1984). Some models for estimating technical and scale inefficiencies in data envelopment analysis. Management Science Maryland, 30(9), 1078-1092.) this model has output orientation and permit comparisons between one Company and others similar. Using the qualitative information collected, was stablished an input. Workers, and an output, weekly sales, with this information the efficiency in weekly sales per worker was studied. Working with a BCC-O model implies increasing the weekly sales, maintaining the number of workers. This is due the social impact of firing worker is minimum.

4 Results and discussion

4.1 Lean Manufacturing tools actually implemented in smes bakery companies.

According with the study the implementation level of lean techniques is low, getting a grade of 2.98 in a 1 to 5 scale. This means, the companies has some advances in the implementation but it is not enough to create value to this industry.

With the qualification by quadrants, most of the companies were located in quadrant III, or vulnerable, 44 of 86 companies, (51.56%) 21 of them in the area of companies delayed (retrazadas) this is due the lack of implementation of lean techniques. But it is important to show that hte 15.12% of the total of the smes companies, are located in the quadrant I or productive ones. This is they have a great level of implementation of lean techniques, but no one was located in the area empresa de clase mundial, world class. In Figure 2 is presented the information before explained.

Figure 2
Clasification of the companies evaluated. Source: Authors. Explanatory note: N.A. means “Does not apply”.

In Figure 3, is presented the average grade of the companies interviewed, is show the grade of each lean manufacturing tool. The poka yoke systems and the 5`s are the tools best implemented. This results has concordance with studies of Dora et al. (2013)Dora, M., Kumar, M., van Goubergen, D., Molnar, A., & Gellynck, X. (2013). Operational perfomance and critical success factors of lean manufacturing in European food processing SMEs. Trends in Food Science & Technology. 31(2), 156-164. https://doi.org/10.1016/j.tifs.2013.03.002.
https://doi.org/10.1016/j.tifs.2013.03.0...
.

Figure 3
Radar of the implementation level of each lean techniques. Source: Authors.

Bakery companies has low level of implementation of lean techniques due to they direct most of their efforts to have excellent quality and fulfill the legal and technical requirements of the food and drugs administration of Colombia (Invima).

4.2 Characterization of the bakery smes companies related with the lean techniques in the study

The most relevant lean techniques implemented are Poka yokes systems, kaizen, and visual Factory, this is because each company knows their defects, number of suggestion given by their employees, exists programs of recognition and awards for suggestions and the person is well trained in visual Factory and 75% of the administration has undergraduate studies, and 43% of the workers has high school studies and the majority of the companies has regional distribution (69%), the age of the technology is between 2 and 8 years old, and the 46% of the companies has regular training programs to their people in order to find waste and defects, and 62% of the people in the factories is trained to work in any position or work station.

4.3 Continuous improvement proposals to increase organizational effectiveness

In this part are presented ideas and recommendations to the companies can move from one quadrant to another, in Figure 4 is shown the improvement route, the companies has to follow.

Figure 4
Improvement route. Source: Authors. Explanatory note: N.A. means “Does not apply”.

According with the weakness identify in the delayed area (rezagados), some actions were presented to let the companies the opportunity to improve and grow (Juárez et al., 2014Juárez, Y., Rojas, J., & Medina, J. (2014). El enfoque de sistemas para la aplicación de la manufactura esbelta. Retrieved in 2014, June 7, from http://www.redalyc.org/artículo.oa?id=61419301005
http://www.redalyc.org/artículo.oa?id=61...
). The improvement actions that permit pass from vulnerable to promisories are presented in Table 1.

Table 1
Improvement actions for delayed organizations.

To move in the route of improvement for one promisorie company to a productive one, Table 2 shows some actions in order to attach this goal.

Table 2
Improvement actions for promissory companies.

Productive companies are good by theirselves but it is important to continue with the lean manufacturing phylosophy and techniques, in Table 3 is presented some actions to achive this goal.

Table 3
Improvement actions for productive companies.

With the objective of complement the information obtained by the questionnarie and the positioning factor, a DEA analysis was done, with the model BCC-O. This model of sales by employee seems contrary to the research done, due lean manufacturing aims to get less cost through the chain but presents results to be used by the smes bakery industry to increase their efficiency. Just 3 companies were efficient, (0.03%) the rest have to improve their cuantitavie relation of weekly sales per worker. Results are shown in Figure 5.

Figure 5
Smes bakery sector efficient level. Source: Authors.

The level of weekly sales recommended, keeping constant the number of workers is presented for quadrant in Table 4. The quadrant I, productives companies is the most efficient.

Table 4
Weekly sales requirement to increase efficiency.

The inneficiencies detail analysis for quadrant shows, in quadrant III, the companies named as delayed (rezagadas), the 93.18% of the companies on this quadrant, (44 companies) needs to increase their sales more than 51%. Those requirements are shown in Table 5.

Table 5
Weekly sales requirements to increase efficiency

In quadrant IV, the companies classified as promisories, the 75.68% of then, 22/29 companies, needs to increaxe more than 51% their weekly sales. Information is presented in Table 6.

Table 6
Weekly sales requirements to increase efficiency.

In quadrant I, the productive companies, the behaviour is similar, the 53.84% of the companies in this area 7/13, needs to increase their weekly sales in more than 51% to increase their efficiency. Those requirements are shown in Table 7.

Table 7
Weekly sales requirements to increase efficiency.

To increase the sales with the same quantity of workers it is necessary to lean the production processes, by reducing wastes, not just diminishing production costs and increasing service level, but promoting a Company culture, since the basement to the top who is always looking for improvements. And to optimize the DEA analysis models of profit and cost model were considered, and the quantitative variables used were, utility margin/time or costs/time.

5 Conclusions and final remarks

The bakery industry is located in the early stages of the implementation of lean manufacturing techniques, but, taking in account they don´t have formal knowledge about lean, in an empirical way, they have implemented some of the topics of the improvement tools, specially related with product quality and productivity.

This research shows that a few organizations are locatede in quadrant I, productive companies, they have high standards of implementation of lean manufacturing techniques, like Poka Yoke systems, kaizen, visual factory and specially TPM. To this bakery sector be considered world class companies they have to reinforce practices like VSM, JIT, and administration.

Some key success factors in smes bakery companies are: Leadership and management, presented in high level of managerial commitment, economical support and constant supervision of the implementation processes, and the limitations to the implementation of lean manufacturing techniques are, process nature, automatization levels, quality requirements and short life cycle of many of the products, people’s training and the informality in the labor.

  • How to cite: Castro, M. R. Q., & Posada, L. G. A. (2019). Implementation of lean manufacturing techniques in the bakery industry in Medellin. Gestão & Produção, 26(2), e2505. https://doi.org/10.1590/0104-530X-2505-19
  • Financial support: None.

References

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    » http://www.laccei.org/LACCEI2011-Medellin/RefereedPapers/PE298_Arrieta.pdf
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    » http://www.sciencedirect.com/science/article/pii/S0923474808000453
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    » http://dx.doi.org/10.1016/j.jom.2006.04.001
  • Jain, R., & Lyons, A. C. (2009). He implementation of lean manufacturing in the UK food and drink industry. International Journal of Services and Operations Management. 5(4), 548-573. https://doi.org/10.1504/IJSOM.2009.024584
    » https://doi.org/10.1504/IJSOM.2009.024584
  • Juárez, Y., Rojas, J., & Medina, J. (2014). El enfoque de sistemas para la aplicación de la manufactura esbelta Retrieved in 2014, June 7, from http://www.redalyc.org/artículo.oa?id=61419301005
    » http://www.redalyc.org/artículo.oa?id=61419301005
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Publication Dates

  • Publication in this collection
    09 May 2019
  • Date of issue
    2019

History

  • Received
    30 July 2017
  • Accepted
    24 May 2018
Universidade Federal de São Carlos Departamento de Engenharia de Produção , Caixa Postal 676 , 13.565-905 São Carlos SP Brazil, Tel.: +55 16 3351 8471 - São Carlos - SP - Brazil
E-mail: gp@dep.ufscar.br