It’s a marketer’s dream — the ability to develop interactive relationships with individual customers. Technology, in the form of the database, is making this dream a reality. Now companies can keep track of customer preferences and tailor advertising and promotions to those needs. For instance, a grocery store system could note that you recently purchased a sample size of dishwashing detergent and could offer you a coupon to buy the large size. Blattberg and Deighton explore the impact of this development on marketing practice and give practical advice on designing a marketing database and staffing an interactive marketing department. They also address customer fears and the public debate over marketing and privacy.