The document discusses the importance of testing the effectiveness of advertisements. It outlines arguments for and against effectiveness testing, including that testing can help avoid costly mistakes but that it also costs money. The document then discusses how to conduct effectiveness research, including determining what to test, when to test, where to test, and how to test factors like message, media, and budget. It provides examples of techniques to test advertisements at different stages, such as pre-testing and post-testing methods. Finally, it discusses frameworks for measuring overall effectiveness and the effectiveness of sales promotions.