0 Replies Latest reply: Aug 1, 2013 3:21 PM by Debbie_1004338a RSS

    About Services and Interfaces

    Debbie_1004338a

      Not sure where to post this, but here goes...

       

      Could someone please help me better understand the differences between a "Service" and an "Interface"?  (Platform neutral)

       

      When someone says "Service", to me that means a mini Program/Function which...

      - Takes in INPUTS

      - Performs one or more PROCESSES

      - Returns OUTPUTS

       

      The "Service" is usually accessible to other Systems - as opposed to a "Function" which implies something internal to a System/Application.

       

      You "call" a Service, and the Service performs some actions.

       

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      When someone says "Interface", to me that means a way to connect to something, whether that be a System, Program, or Function.

       

      In Programming, you typically refer to an "Application Programming Interface" (API).

       

      With Systems, I have typically heard the term "Interface" as in an "Interface Control Document" (ICD).

       

       

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      Now talking about these concepts together....

       

      To me, an "Interface" is a static thing that takes INPUTS and returns OUTPUTS in a certain format.  Nothing more.

       

      A "Service" is a dynamic thing that actually performs one or more activities.

       

      When doing requirements and diagrams, wouldn't you want to show the SERVICES and the DATA that is passed between them, and *not* show INTERFACES which are really just a means to an end?

       

      On my current project, I have inherited a bunch of requirements that are impossible to read, and it seems like the author did not understand the difference between a "Service" and an "Interface".

       

      Hope my ramblings and questions above make some sense?!

       

      Sincerely,

       

       

      Debbie