In addition to these factors McPhee cited other important factors which influence the load, but which may vary between individuals. These were the work postures adopted, unnecessary use of static muscle work or force, speed and accuracy of movements, the frequency and the duration of pauses taken by the operator. Third, according to McPhee, are factors which altered the individual’s response to a particular load, individual factors (such as age and experience), workplace environmental factors and psychosocial variables, Many other authors have also reported on risk factors associated with upper limb