Helder Gomes Costa

Application of an integrated decision support process for supplier selection

In many firms the value of purchased materials and components accounts for 50–80% of total cost of goods sold. For those firms, purchasing decisions cause enterprise wide side effects, and, therefore, should be treated as an integration matter. Supplier selection is a problem that deals with both qualitative and quantitative issues that must be measured using information that is normally spread within the enterprise. To see how this problem was addressed in a small construction company in Brazil, an integrated procurement process, which is a simplification of a more complex methodology, is presented. The case study shows the importance of simpler, yet efficient, solutions to address the decision making problems of smaller enterprises in development countries—a research and commercial niche not well developed yet.

ELECTRE TRI aplicado a avaliação da satisfação de consumidores

Resumo As abordagens usuais para conhecer a percepcao do consumidor quanto ao desempenho de servicos baseiam-se em impressoes do consumidor (julgamentos subjetivos) a luz de multiplos criterios. Em geral estas abordagens consideram uma funcao de agregacao do tipo media ponderada, que apresenta efeitos compensatorios indesejaveis. O presente trabalho explora a aplicacao do Auxilio Multicriterio a Decisao, mais especificamente no metodo ELECTRE TRI, a classificacao ordenada da satisfacao dos consumidores. Isto adapta uma modelagem de apoio a decisao para um problema de diagnostico do grau de satisfacao. Um tratamento inedito para a estimativa dos parâmetros p e q (limites de preferencia e de indiferenca, respectivamente) e incorporado a modelagem, incorporando maior robustez ao uso de um metodo de AMD monodecisor na resolucao de um problema multidecisor. Trata-se de forma inedita a questao de incomparabilidade, destacando que nem sempre a mesma e originada por impericia na modelagem ou nas avaliacoes de desempenho. Uma importante diferenca em relacao aos metodos tradicionais de avaliacao de desempenho e a independencia do emprego do resultado em relacao ao valor numerico da escala de julgamento de desempenho. A aplicacao desta abordagem proposta e experimentada na avaliacao da satisfacao dos consumidores de uma bombonniere instalada em um shopping center.

Nonlinear programming applied to the reduction of inconsistency in the AHP method

Analytic Hierarchy Process is one of the most known multicriteria decision aid methods. Nevertheless, as it relies on decision makers (DM) pairwise comparisons, a problem may occur if some comparisons are not well done. This issue, known as inconsistency, appears when an inconsistency threshold is violated. One way to deal with inconsistency is to redo all judgments, as many times as needed, in order to reach acceptable levels. This work proposes a nonlinear programming model that reduces inconsistency to zero or near zero, without needing to redo all judgments. The reduction is achieved by adjusting the original judgments in a minimum way, keeping the DM’s decisions within a tolerable range. Only discrete values are generated, so the solution respects the limits of the Saaty scale (1–9). To illustrate the efficiency of the nonlinear model, a comparison between the proposed model and other models taken from recent literature was made. The results show that the proposed model performed better, since the original judgments were changed in a minimum way, also the inconsistency was completely removed. Alternatively, if some inconsistency is allowed more original judgments can be preserved.

Métodos de auxílio multicritério à decisão aplicados a problemas de PCP: mapeamento da produção em periódicos publicados no Brasil

The objective of this study is to map the Brazilian scientific production based on Brazilian journal publications on the implementation of Multicriteria Decision Aid (MCDA) to model Production Planning and Control problems. It consisted of 32 papers that were systematically selected from journals indexed in the Scielo database and also from a list of journals suggested by major Brazilian Industrial Engineering research societies. The results revealed, among other aspects, the journals that publish the most on this topic, the most often used MCDA methods in this interface, the production sectors in which the applications took place, and the most commonly discussed PPC topics. This paper also highlights the PPC aspects that need further research including MCDA methods.

Emprego de uma abordagem multicritério para classificação do desempenho de instituições de ensino superior

Desde os anos 90, o sistema universitario brasileiro tem vivenciado um grande crescimento caracterizado pelo aumento da quantidade de Instituicoes de Ensino Superior (IES) e tambem da quantidade de cursos de nivel superior oferecidos por estas instituicoes. Neste contexto, e essencial que exista um Sistema de Avaliacao da Educacao Superior eficiente que seja capaz de monitorar as informacoes destas instituicoes e assegurar que a Qualidade em Educacao fornecida por estas atendam os padroes recomendados. Uma das formas de obter a eficiencia deste sistema consiste em avaliar continuamente o desempenho das IES a luz de varios criterios. Neste sentido, este artigo emprega uma abordagem multicriterio fundamentada no emprego do metodo da Media Ponderada para classificar o desempenho de Instituicoes de Ensino Superior (IES) segundo a percepcao de professores e alunos. Com o intuito de investigar o emprego desta abordagem, foi realizado um estudo de caso em uma universidade publica. Foram identificadas as fraquezas/potencialidades e os pontos criticos que devem ser priorizados em prol da melhoria da Qualidade em Educacao.

Avaliação e classificação da qualidade de serviços utilizando uma abordagem multicritério

This study describes an original multicriteria approach for classifying/ordering the quality of services given by companies using the measurement of customer satisfaction rate. Based on the combination of an MCDM methodology (ELECTRE III Method), with Quality tools statistical methods, this methodology presents special features which incorporates a scientific treatment into the subjectivity present in the procedure of evaluating the customer satisfaction rate - which differs from the other methods used in this context. This study also presents the results of an experiment to identify the difficulties found in the implementation of the methodology.

A literature review on lot size with quantity discounts: 1995-2013

Purpose – This paper aims to present a literature review on models developed for the economic order quantity (EOQ) problem with incremental and all-units discounts, extending the work of Benton and Park (1996) which covered the most significant literature, from 1963 to 1994, about EOQ with discounts and that has identified four open areas in this field of study. The modeling of lot size with discounts wishes to give good solutions for realistic situations, such as those concerning the discounts offered by suppliers, to rises in the demand. Design/methodology/approach – The research was carried out in papers published from 1995 to 2013, and indexed in databases as Scopus and ISI Web of Science. The papers were compared through objective function, constraints, discounts, developed algorithms, allowance of shortages or multiproduct, demand pattern and buyer or buyer–supplier perspective. Findings – Results indicate two areas that still remain untouched, and probably the main cause is due to mathematical comp...

A Set of Criteria for Selection of Enterprise Resource Planning ERP

Information systems have evolved at a continual pace since administrations began to develop greater interest in production processes and supply chains. This created systems like Enterprise Resource Planning ERP, Material Requirements Planning MRP, and Manufacturing Resources Planning MRPII. This research discusses a literature search conducted to map the multicriteria models used to select ERP systems. As a result, this article proposes criteria and subcriteria to be used in the selection of ERP systems. The basic structure is developed around a tree and subcriteria tree that can be used as a checklist for companies wishing to acquire an ERP system.

Avaliação de transportadoras de materiais perigosos utilizando o método electre tri

Neste trabalho apresenta-se uma metodologia para a classificacao e escolha de prestadores de servico para transporte de materiais perigosos, fundamentado na metodologia de Auxilio Multicriterio a Decisao - AMD. A metodologia aqui proposta apresenta caracteristicas que permitem considerar a subjetividade inerente ao processo de avaliacao de desempenho dos Prestadores de Servico, diferenciando-se, assim, de outros metodos de selecao de fornecedores de servicos de transportes. As particularidades da metodologia proposta, principalmente em relacao a sua aplicabilidade, foram verificadas num caso em uma empresa distribuidora de combustiveis, com rede de postos em todo o Brasil.

Impacts of Lean Six Sigma over organizational sustainability: A systematic literature review on Scopus base

Purpose In a view to its comprehensive and diverse applicability, the methodology Lean Six Sigma (LSS) has the potential to the generation of impacts on various aspects of an organization. This paper aims to carry out a systematic study of LSS impacts on organizations, analyzing their relation to organizational sustainability through the triple bottom line perspective. Design/methodology/approach A systematic review of the existent literature on LSS was performed and the identified impacts were later classified as correspondence with three dimensions of organizational sustainability: financial, social and environmental. Findings There were identified 25 main impacts of the LSS through a systematic research of the literature. A greater correspondence of the LSS have been identified over a range of economic results in organizations; however, it was also possible to notice that the methodology has been directing its efforts gradually to meet further perspectives of sustainability, particularly by looking for a better relation with employees and customers. Practical implications The organizations that use the LSS as methodology to continuous improvement will be able to identify which impacts may need to be achieved primarily by the projects undertaken to enhance the achievement of a more sustainable management. Because of its comprehensive character, this paper can help organizations belonging to various industries and sectors of society. Originality/value Despite the growing number of published articles on the methodology LSS, it has not been identified articles that look for the study of the application of the methodology as a mechanism for increasing sustainability in organizations. Within the scenario presented, this study sought to assist the filling of this gap.