Some genealogy programs, such as Legacy allows you to print out a narrative with blank lines for missing data. This is a great way of visually see what information you are missing. Plus this is a great way to get family members to fill in the blanks. Just mail them a copy of their portion of the report and ask them to fill in any known blanks.
If your program doesn't have a nice feature as Legacy, most genealogy programs allow you to print blank lines via the family group sheet.