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Crticial Functional Analysis1 Critical Functional Analysis (CFA) is a technique used to describe information processing systems in terms of critical paths of processing functions. Somewhat like supply chain or critical path analysis, it provides a transparent means of identifying potential systems processing bottlenecks. It is used to select out combinations of required functionality which could represent challenges to successful implementations and risking failures or delays in meeting specified standards. Such delays are associated with escalating costs, which in the case of large systems, can be significant. CFA is used to select modules to be used under Internet Systems Prototyping Services where potential users can test out modules to prove and test feasibility. Such operational modules can be used to stress test so as to establish the feasible operational envelopes of subsystems in terms of data handling and throughput capacities. 1: Critical Functional Analysis was developed under the Seel-Telesis® applied R&D programme at the Systems Engineering Economics Lab.