Anayaat has given you sound advice. However, if you design your own questionnaire or adapt one then you need to conduct statistical test to ensure that your grouping of questions is right.
While searching for information I came across this site which gives detailed info about Statistical methods/tests
Elementary Concepts in Statistics
Also see <link no longer exists - removed> found at Google
Have a nice day.
Simhan
While searching for information I came across this site which gives detailed info about Statistical methods/tests
Elementary Concepts in Statistics
Also see <link no longer exists - removed> found at Google
Have a nice day.
Simhan