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13. 3-tier
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The purpose of 3-tier programming is to separate the 3 standard "layers" of an application: Interface (UI), processes and data.
Therefore, an application will include 3 separate tiers:
  • a presentation layer,
  • an application layer,
  • a layer for accessing the data.
The objective with this separation is to make each layer independent, in order to facilitate maintenance and future developments of the application. This provides better security because the access to the database is allowed via the Processes layer only. It also optimizes teamwork and multi-target development.
Managing the 3-tier
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