Orthogonal approach
\ldeno{}{\footnotesize
objects -- {\em modular computing \c{agents}}\n
types -- expression classification\n
delegation -- resource sharing\n
abstraction -- {\em interface \c{specification}}\n
}\nl
type: behavior specification\n
delegation: ancestors \c{(with dynamic self-reference)}
\nl\ifsli{\vspace{-1cm}}{}
slide: Orthogonal dimensions