You want to set your fields so they can be easily sorted. Don’t just enter Name, Address, Phone, but set up as LastName: FirstName: Title: (Mr Ms Dr, etc) CompName: Address1, Address 2, Address 3. City: State: Zip: HomePhone: BusPhone: MobilePhone: etc.

Then once everything is entered, you can sort the entire list by the specific fields. For example, if you sort by ADDRESS1, it will show if there are 2 (or more) entries for a specific address number, and you can compare the entries and delete any redundancy. You can sort by Phone numbers or Lastnames, Company names, etc. to check for any duplication as well as typos, inconsistent entries, or missing data.

For a complex solution, you can build a small software using foxpro or vb to validate the first few letters of what you type againest any prev entry and suggest matches againest existing entries.