1. Is it possible to reduce previous research survey item's Likert scale and use the same items in the new research? Ex: 7-Point Likert scale to 5-Point Likert Scale?
2. If we reduce as mentioned above, will it make any issue?
3. On what basis we can reduce the likert scale ? How to justify the reasons for reducing the Likert Scale?
4. Please give me any good references (published papers) for this issue.