While many recommender applications are still global in nature, more are beginning to respond to the customer’s current state by using the customer's current navigation to provide context for the production or refinement of recommendations. Consumer behaviors interpreted for this input include both actions the consumer would have performed in exactly the same way even if he was unaware of the recommender system, and actions the consumer performs for the sole purpose of enhancing the recommendations. Implicit navigation inputs are, generally, inferred from the customer’s behavior without the customer's awareness of their use for recommendation processes. This input may include the specific item or items that the customer is currently viewing or those items in the customer's shopping cart. For example, Amazon.com utilizes the particular book that a customer is browsing to recommend a set of additional books considered in some way similar to the currently viewed text. This input may also include the category or feature
to which the customer has navigated. In doing so, e-merchants hope these applications will help convince the browser that the initial product is worthwhile – if he likes the “similar” item(s) – and help sell multiple products at once.