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14. 3-tier architecture
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The 3-tier architecture is a model for application architecture.
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 reason for separating the layers is to simplify the maintenance and the future evolutions of application. This provides better security because the access to the database is allowed via the Processes layer only. It also optimizes the teamwork and the multi-target development.
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