“…In fact, some studies are beginning to deeply research the area of sustainable building maintenance. This can be supported by the clear evidence of a high rate in users' perceptions of sustainable building Baird (2015), the criticality of activating operation and maintenance manuals in low-carbon/sustainable buildings (Frank et al, 2015), and the guide to green maintenance and operation Kaufman and Balsley (2009) 2.2 LSS LSS is as a methodology of business improvement that aims to maximise shareholder value by focusing on improving customer satisfaction, speed, quality, and cost (Franchetti, 2015;Laureani and Antony, 2011). In fact, it is a mix of tools and principles from Lean and Six Sigma that complement each other.…”