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Purpose The purpose of this paper is to identify the latent constructs of various barriers affecting Six Sigma implementation in Indian industries. Design/methodology/approach Literature review resulted in 15 frequently reported barriers in Six Sigma implementation. An empirical survey of 168 Six Sigma practitioners including green belts, black belts (BB), and master BB from 40 Indian companies was conducted with the help of a structured questionnaire. The responses were analyzed using exploratory factor analysis which resulted into five constructs. Findings The study proposes five constructs, namely “role of top management,” “cultural change,” “expected attitude,” “availability of resources,” and “level of quality maturity.” The focused approach by organizations to overcome barriers in Six Sigma can be oriented using these constructs. Practical implications Six Sigma implementation needs elimination of barriers in projects. Top management support in planning and resource allocation supplemented by favorable employee attitude in bringing cultural change can develop quality maturity to implement Six Sigma successfully. Originality/value This study fills the gap in the literature by studying critical success factors, critical failure factors, and barriers together. This study is one of its kinds in the Indian context which captures the views of Six Sigma certified professionals from the organizations which are implementing Six Sigma.

The objectives of this paper are to review journal articles published between 2003 and 2015 related to supply chain risk sources, with a view to list and define supply chain risk sources identified by various researchers and critique the various supply chain risk classification schemes. For the purpose of this literature review, we adopted the methodology of a content analysis based literature review. Towards this end a conceptual risk classification framework was defined and supply chain risks identified by various researchers mapped into it. An analysis of the surveyed literature revealed the various supply chain risk sources and associated risks identified by the researchers. It is seen that while supply chain risk classification has been done by several researchers, it is not the main focus area of research for a majority of researchers but appears supplementary to other research goals. While the various supply chain risk classification schemes reviewed have sufficient breadth or depth to effectively address the diverse variety of supply chain risks, some important risk sources like product characteristics and returns processing have scope for further research. A new, comprehensive conceptual risk classification framework has been defined for the literature review. The review takes into account the current thinking on concept of risk and supply chain risks.

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Purpose – Buyer companies’ engagement with suppliers varies according to their specific business needs. Prior models of supplier classification are based on the dimensions like product specification or criticality of purchase. As the supply chains are embracing collaboration among partners to respond to the dynamic market conditions, it is prudent to study the changes adopted by buyer companies for supplier classification. The paper aims to discuss these issues. Design/methodology/approach – This is an exploratory research for identifying the criteria used for supplier classification based on the interviews of practitioners from buyer multinational manufacturing companies operating in India. The content analysis of the subjective responses led to the identification of distinctive criteria. Findings – Although, many of the practitioners were unaware of the model per se, they labelled their suppliers as per the types stated in the Kraljic model. They mentioned twenty six criteria for supplier classification; five of which do not have any reference in the extant literature. The degree of presence of these criteria provides a multi-criteria framework for supplier classification that has been further extended based on prior models. Research limitations/implications – The exploratory nature of the study, its confinement to Indian milieu and small sample size could limit the generality and exhaustiveness of the findings. Practical implications – The framework and its extension can be used by practitioners in assessing and classifying their suppliers for strengthening supply chain collaboration. Originality/value – This research unveils five new criteria used by buyer companies for supplier classification. The multi-criteria framework for supplier classification and its extension give new insights into the supplier characteristics significant for supply chain collaboration.