TY - JOUR AU1 - Ram Matawale, Chhabi AU2 - Datta, Saurav AU3 - Sankar Mahapatra, Siba AB - Purpose – Lean manufacturing is a production practice that considers the expenditure of resources for any goal other than the creation of value for the end customer to be wasteful, and thus a target for elimination. In today's competitive global marketplace the concept of lean manufacturing has gained vital consciousness to all manufacturing sectors, their supply chains and hence a logical measurement index system is indeed required in implementing leanness in practice. The paper aims to discuss these issues. Design/methodology/approach – The present work exhibits an efficient grey-based leanness assessment system using concept of grey numbers theory. Findings – Such leanness estimation can help the enterprises to assess their existing leanness level; can compare different industries who are adapting this lean concept. The methodology described here has been found fruitful while applying for a particular industry, in India, as a case study. Originality/value – Lean extent evaluation module (lean index appraisement system) exploring grey numbers theory is quite new and not documented in literature before. TI - Lean metric appraisement: exploration of grey numbers set theory JF - Grey Systems Theory and Application DO - 10.1108/GS-03-2014-0008 DA - 2014-10-28 UR - https://www.deepdyve.com/lp/emerald-publishing/lean-metric-appraisement-exploration-of-grey-numbers-set-theory-Ni8E2es1Lq SP - 400 EP - 425 VL - 4 IS - 3 DP - DeepDyve ER -