Abstract.The objective of the study is to identify the symptoms ofmusculoskeletal disorder (MSD) and ergonomic risks on manual handling task at a metal stamping company. Data were collected using Cornell Musculoskeletal Discomfort Questionnaire (CMDQ) and the Rapid Upper Limb Assessment (RULA). The results revealed that there were significant relationships between selfreported pain and RULA posture scores on the trunk and neck regions with reference to MSD symptoms. Further, the results of RULA score also indicated high risk posture level on the task being investigated.

Human performance seems to be neglected in the design of assembly and disassembly of a product despite the increasing awareness among people on green environmental issues. Incorporating an ergonomics evaluation can be considered as an alternative empirical solution to tackle the issue efficiently. Therefore, the objective of this study is to investigate human performance with reference to muscle activity while performing assembly and disassembly of manual tasks focusing on load variability. Upper limb muscle activities were investigated in this study. Twenty participants were asked to perform assembly and disassembly of selected tasks at two load-levels. The results of this study indicated that load tasks affect human performance. The findings from this study highlighted that the muscle activity for the medium load task was prone to fatigue faster than the low load task (28.19% in average). Thus the study has revealed the importance of incorporating the ergonomics principle solution in the design of assembly and disassembly tasks to increase human performance.