Source : Free On-Line Dictionary of Computing

subject-oriented programming
     
         Program composition that supports building
        {object-oriented} systems as compositions of {subjects},
        extending systems by composing them with new subjects, and
        integrating systems by composing them with one another
        (perhaps with {glue} or adapter subjects).
     
        The flexibility of subject composition introduces novel
        opportunities for developing and modularising object-oriented
        programs.  Subject-oriented programming-in-the-large involves
        dividing a system into subjects and writing rules to compose
        them correctly.  It complements {object-oriented programming},
        solving a number of problems that arise when OOP is used to
        develop large systems or suites of interoperating or
        integrated applications.
     
        {IBM subject-oriented programming
        (http://www.research.ibm.com/sop/)}.
     
        (1999-08-31)