Not all system elements must be modeled with the same level of detail; more effort can be spent on novel or high-risk elements to fully characterize them (and lower-fidelity elements may be revisited if analysis indicates the effort is warranted). What elements would you model at lower fidelity in an autonomous automobile? A satellite? An e-commerce system? Not all system elements must be modeled with the same level of detail; more effort can be spent on novel or high-risk elements to fully characterize them (and lower-fidelity elements may be revisited if analysis indicates the effort is warranted). What elements would you model at lower fidelity in an autonomous automobile? A satellite? An e-commerce system