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14. 3-tier architecture
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3-tier architecture is an application architecture model.
Its basic principle consists in dividing an application into 3 layers:
  • the presentation layer: corresponding to the display.
  • the process or application layer: corresponding to the business processes of application.
  • the layer for accessing persistent 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.
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