Threetier definition

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From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:

  three-tier
       
           A {client-server} architecture in which the
          {user interface}, functional process logic ("business rules")
          and data storage and access are developed and maintained as
          independent {modules}, most often on separate {platforms}.


       
          Apart from the usual advantages of modular software with well
          defined interfaces, the three-tier architecture is intended to
          allow any of the three tiers to be upgraded or replaced
          independently as requirements or technology change.  For
          example, an upgrade of desktop {operating system} from
          {Microsoft Windows} to {Unix} would only affect the {user
          interface} code.
       
          Typically, the user interface runs on a desktop {PC} or
          {workstation} and uses a standard {graphical user interface},
          functional process logic may consist of one or more separate
          modules running on a {workstation} or application {server},
          and an {RDBMS} on a database server or {mainframe} contains
          the data storage logic.  The middle tier may be multi-tiered
          itself (in which case the overall architecture is called an
          "n-tier architecture").
       
          (1998-05-13)
       
       

















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