[1]. J.N.Saraji et al. (2004) were evaluation of WMSDs risk factors among the crew of the Iranian Ports and shipping organization’s vessels. This paper clarify the WMSDs are major problem in almost all countries and are important causes of work incapacity and loss of work days. The aim of their studies is evaluation of WMSDs symptoms among the workers by using Nordic Musculoskeletal Questionnaire (NMQ) and determination of WMSDs risk factors by application of OWAS. After determination of risk factors, the OWAS methods can be used to identify any possible correction in working posture that leads to a better and less harmful posture