Problem Trends -e Why Hard? What about software Syllabus Too complex for complete analysis Separation into non-interacting subsystems distorts the results The most important properties are emergent Too organized for statistics Too much underlying structure that distorts the statistics Organized Complexity"(Weinberg) Copyright Nancy Leveson, Sept 1999Problem Trends Why Hard? What about software? Slyllabus Too complex for complete analysis: Separation into non-interacting subsystems distorts the results. The most important properties are emergent. Too organized for statistics Too much underlying structure that distorts the statistics. "Organized Complexity" (Weinberg) Copyright c Nancy Leveson, Sept. 1999 �