How and What to Test Effectively

In other words, you wouldn’t want to take a test list of 10,000, run it through the merge/purge netting around 8,000 records, then split this group into three equal groups of 2,666 each. What’s more, you’ll want to test more than one outside list.

Results can vary by list, therefore, test about five outside lists. Each sample size would be too small for testing purposes.