http://www.ibm.com/search/?en=utf&v=14&lang=en&cc=us&lv=c&q=%22System+Object+Model%22&x=8&y=9
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The System Object Model  
* embodies features commonly associated with object oriented programming systems 
** implementation 
** inheritance
** encapsulation 
** polymorphism
* also advanced capabilities including 
** metaclasses
** user intercept 
** control of M''''''ethodDispatch and D''''''ynamicClassConstruction 
* provides 
** a rich, extensible, object model with complete runtime support for its semantics
** these capabilities in a language independent way that solves the fragile base class problem 
** programmers with a familiar object-oriented paradigm for building their applications
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CategoryMethodology