sentences:  If a specific ad variation out performs the baseline in the copy test, to a desired level of statistical significance, this new copy variation should be used by the marketer.In 1982, a consortium of 21 leading advertising agencies — including N. W. Ayer, D’Arcy, Grey, McCann Erickson, Needham Harper & Steers, Ogilvy & Mather, J. Walter Thompson, and Young & Rubicam — released a public document laying out the PACT (Positioning Advertising Copy Testing) Principles that constitute a good copy testing system.PACT states a good copy testing system must meet the following criteria