▪ Profile: A profile subsumes a user’s attributes and interests, which may be captured and consolidated by the advertiser, a third party, or may be set up by a consumer him or herself (Cremonese et al. 2010). A user profile is typically considered static (Liapis et al. 2008).▪ Interest: Although no less than 12 publications in the sample consider tailoring advertisements to a user’s interest, they do not provide a clear-cut definition for this attribute. Still, Kaasinen and Yong-Ik (2013) points out that interest is not static and tracking a user’s transaction history could be extremely helpful in order to determine a user’s likes and interests.▪ Preferences: While behavior is usually logged by a consumer’s actual activities, consumers typically state preferences themselves (e.g., favorite movie, favorite band, favorite food, etc.). While scientific studies usually ask their participants for their preferences in a questionnaire, in real-world applications such data is collected when the consumer registers for a platform, social communities, or for mobile apps.▪ Behavior: This category implies that an advertisement is sent or shown based on a consumer’s behavior, which may be obtained and analyzed from online behavior (e.g., search patterns when using search engines, clicking behavior in a browser), or from sensing and analyzing behavior in the ‘offline’ world. Future advertisements such as rebates or recommendations may then be steered based on the consumer’s prior behavior. For instance, if having data on what a consumer is frequently searching for (e.g., through search term analysis), a compatible advertising message may be addressed to this consumer. This kind of adaptation of advertising messages is also known as ‘behavioral targeting’.▪ Demographics: Similar to preferences, demographical data is typically asked for when registering for a service or an online community. This data (in many cases demographics are reduced to age and gender) may be used to tailor the advertising message to the particular demographics. For instance, an advertisement for a shop for ladies wear would only be delivered to women.▪ Weather: Contents may orientate on a consumer’s current weather situation (e.g., temperature, humidity, wind force). This information may, for instance, be obtained from combining a consumer’s location data with data from weather services.▪ Characteristics of surrounding environment: This attribute concerns the physical context of a consumer at his or her current location.▪ Mobile device: Information about the specification of a consumer’s device (e.g., display resolution, operating system) can be used to adapt, for instance, the graphics of an advertisement displayed to the corresponding display resolution.▪ Situation: While authors typically use explicitly the term “situation” (e.g., Merisavo et al. 2007; Kim et al. 2011b), we claim this term is too fuzzy as an adaptation attribute. Actually, this category circumscribes a consumer’s perceived readiness for consuming. For instance, if a consumer is at home or at work absorbed in a certain task, the probability is low that he or she would pay attention to an advertisement and follow up with a purchase. If he or she, instead, is searching for a restaurant at lunch break or is shopping, the probability to follow up the advertisement’s message is higher.▪ Nearby objects: This category is closely related to the attribute “characteristics of surrounding environment”, as it also relates to the physical context of a consumer. Hristova and O'Hare (2004), for instance, relate to restaurants, museums, etc. that are close-by as objects that may be relevant for a consumer at a certain location.