I think pprince nailed it. If the fields are on the same screen/page they should be one report. If they are on different screens/pages there should be one report for each page. Another issue is the development team. I have worked with some that would go nuts if you opened three reports under that scenario and others that would not care. The reason that is significant is that you must maintain a good relationship with them. After all finding the most bugs does not make a good tester. A good tester is the one that gets the most fixed.