We have a questionnaire, which have many questions on 6-point likert scale. So these variables are ordinal, not normally distributed. In performing factor analysis, there are two major methods in extracting factors, one is maximum likelihood and the other is principle axis factors. The maximum likelihood is said to perform better than PAF, but in our case the item variables are ordinal (1-6 likert scale), will this be okay to use maximum likelihood, or better to use PAF?