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.

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