2.2. Participants
Ten college students (five boys group and five girls group) participated in the experimental study on a voluntary basis. The average age of the participants was 21.5 yrs with a standard deviation of 1.11 yrs. Mean stature was 1850 mm with a standard deviation of 101 mm. This indicated a significant size difference among the participants. The participants had no prior experience on the assembly task. They were given instructions on the assembly workstations and task and trained for 15 minutes on the task, as required based on their experimental conditions. Fifteen minutes training was considered adequate as the assembly task was not a complex task according to the learning rate. Environmental condition (light, temperature, humidity and noise) was comfortable and kept constant. The participants wore light and comfortable clothes.