The first questionnaire was used for surveying
customer needs, as shown in Figure 2 as “customer requirement”.
At 90% confidence interval, it was found that at least
58 customers are needed to be surveyed regarding to Equation
1 in order to obtain the customer needs’ information.
The second questionnaire was conducted to obtain the significance
level of needs indicating in Figure 2 as “imp”. The
third questionnaire was used to achieve the satisfaction
rating of the case study factory in comparison to other