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• ELECTROWEAK SECTOR

• Perturbation theory can always be used

• Theory gives unambiguous high-precision results (~0.1%)

• INPUT PARAMETERS

• me , mm , mt ,¼, MZ , e Þ Electroweak Þ MC Theoretical

• MH , MW , VCKM Generator Predictions (si )

• QCD SECTOR

• Perturbative QCD + Non-Perturbative QCD

• Limited by understanding of confinement and fragmentation

• Prediction unambiguous modulo these model-dependent effects

• ... in this sense descriptive rather than predictive

• No one expects QCD generators to agree to the level of 1%.

• obs.: agreement can be forced in artificial way adjusting

• parameters ( ¹ physics )