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If your copywriting is for mail order be very careful before sending out hundreds or thousands of letters. To do a response test, send an amount in proportion to what you are planning to send in the final mail out. For example: If you are planning a mass mailing of say 1000 or more brochures, leaflets etc, send 150 test copies.
You may have three great headlines that you are torn between, and various approaches to the offer that are all very good. Through this information you may have compiled three very good pieces of completed copy which are hard to seperate. Send fifty of each variation to test their effectiveness. Which ever one of the three sample gets the most responses then naturally you will use it for the final mass mail out.