You are the developer; you all familiar with n-tier architecture so no need for the details. Here is abit of recap for you.

N-Tier Application Design

• DataAccess Layer (DA): contains all code necessary to execute SELECT, INSERT, UPDATE and DELETE statements in the database, access views, datatypes of your programming languages.
• Business Logic Layer (BL): contains code that implements the rules of your business.
• UserInterface Layer (UI): contains code that puts data into specific control in order to display it for your users.

The advantages of 3-tier design

• Able to change your application to completely different user interface without losing the other two layers of your code.
• Business rules are saved in central location. If you decide to change the process for validation an Order, you only have to change it in one place.
• If you change your DB, you only need to change DA layer.

I’ll fill up more later.

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