At first I would check for correlations with other scales or interviews which measures the same dimensions as your tool.

I recommend that you develop a standard for each factor. The standard are built on standardized z notes. Starting from standardized notes z, you can build standardized different scale, for exemple: standard nine, standard ten (sten), T notes, IQ deviation. Formula for standard ten(sten) is 5,5+z, for T notes is 50+10z, for IQ deviation is 100+15z. Z notes are calculated in the SPSS program, menu Analyze - Descriptive Statistics- Descriptives . In Descriptive you need to cheek the option Save standardized values as variables. To calculate the z scores you first need rough scores from at least 30 subjects. For a good standard you need 250-300 subjects.

Thank you Marius Babici for your time and inputs. I am not expert to understands what you said, can you please direct me to a source i.e. an article, lecture notes or book where I can read thoroughly the process you mentioned.

I recommend you consult the following papers:

1. Standards for Educational and Psychological Testing, 2014, by American Educational Research Association (Author), American Psychological Association (Author), National Council on Measurment in Education (Author)

2. Handbook of Psychological Testing 2nd Edition by Paul Kline

3. Handbook of Test Development (Educational Psychology Handbook) 2nd Edition by Suzanne Lane (Editor), Mark R. Raymond (Editor), Thomas M. Haladyna (Editor)

4. Applied statistics in Socio-human sciences. Regarding this field, we have only studied Romanian authors who have not been translated into English, so I recommend that you search for English authors who deal with the field of statistics applied in the social sciences.

I also recommend a new book The Wiley Handbook of Psychometric Testing, 2 Volume Set: A Multidisciplinary Reference on Survey, Scale and Test Development 1st Edition by Paul Irwing (Editor), Tom Booth (Editor), David J. Hughes (Editor).

Dear Marius Babici , Thank you very much.