Lean construction is a way to design production systems to minimize waste of materials, time, and effort in order to generate the maximum possible amount of value". Compared with mass production, lean production employs fewer resources, such as manufacturing plant, space, time, investment, design activities, and on-site inventory level to deliver a similar product with the same level of quality in the most economical and efficient manner. Leanness index provides a direction to eliminate or at least reduce manufacturing wastes during the implementation of lean strategies towards continuous improvement. The leanness measure models provide a tool to track, assess, and compare the leanness level of the organization during lean manufacturing transformation. All performance measures were assumed equally important, and the relationships between lean performance metrics were not considered in the reviewed literature. Therefore, there is a gap in the literature to investigate strategies to priorities different performance metrics according to competitive strategies and manufacturers requirements and include the interrelationship between lean performance metrics in the current leanness assessment models. This can increase the accuracy of the leanness assessment approach and reflect the manufacturers needs in the overall leanness score.
Key words: Lean construction, Construction waste, Leanness index, Lean performance matrix
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