“…The managers are usually focused on factors as machinery, attendance and quality control, and professional knowledge and task training. However, previous research has definitely shown that there are other opportunities to optimize OLE; these consist of efforts aimed at optimizing environmental factors that affect the mental, social, and physical well-being of the workforce: workers’ attitudes and behaviours have a significant effect on their work performance and the production process [ 32 , 33 ]; and lack of motivation affects the labour effectiveness not only directly, but also indirectly through the workers’ knowledge and skills [ 30 ]. Production rate and labour effectiveness are also affected by health and safety of the labour force, ergonomic work conditions [ 9 , 10 ], ‘extrinsic rewards’ [ 29 ], and environmental factors such as noise, lighting, humidity, and temperature [ 7 , 20 ].…”