1. While ATL promotions are tailored for a mass audience, BTL promotions are targeted at individuals according to their needs or preferences. While ATL promotions can establish brand identity, BTL can actually lead to a sale. ATL promotions are also difficult to measure well, while BTL promotions are highly measurable, giving marketers valuable insights into their return-on-investment. Promotional activities carried out through mass media, such as television, radio and newspaper, are classed as "above the line" promotion. "Below the line" promotion refers to forms of non-media communication or advertising, and has become increasingly important in the communications mix of many companies, not only those involved in fast moving consumer goods, but also for industrial goods. 2. Out-of-home advertising (or outdoor advertising) is made up of more than 100 different formats, totaling $6.99 billion in annual revenues in 2008 in the USA. Outdoor advertising is essentially any type of advertising that reaches the consumer while he or she is outside the home. This is in contrast with broadcast, print, and Internet advertising. Out of home advertising, therefore, is focused on marketing to consumers when they are "on the go" in public places, in transit, waiting (such as in a medical office), and/or in specific commercial locations (such as in a retail venue). Outdoor advertising formats fall into four main categories: billboards, street furniture, transit, and alternative. If you read the above definitions carefully, you’ll understand that OOH can be used for both ATL and BTL promotions.