Abstract

The business tier is where the application logic or business rules reside. It’s a slice of functionality that represents a solution to a set of problems in a particular business domain. There are many names being used today for the business tier, such as the middle tier, the application tier and the server tier. But they all imply the same thing: the brains of your application where the computation of business rules occurs. The business tier performs business processing on behalf of the presentation tier (either a web tier or a client tier). To fulfill those processes it communicates with back end data stores and the Enteprise Information Systems tier (EIS) to retrieve any persistent business data that needs to be manipulated or transformed during the course of a business transaction.

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