Following completion of the first iteration of concept generation in a typical tradespace study,the analyst models and simulates the design alternatives to calculate the costs and utilities of alternative concepts. However, in MATE for Survivability, it is first necessary to characterize any disturbances in the operational environment (Phase 3) and to apply the survivability principles to the tradespace (Phase 4). Phase 3 is comprised of three tasks: (3.1) enumerate disturbances, (3.2) gather data on disturbance magnitude and occurrence, and (3.3) develop system-neutral models of disturbance environment.