FAST Diagram Procedures

HOW? WHY? Prior Time Later Time Design Objective One Time  Functions Functions that happen "All the Time" Design Objective Design Objective Basic Function Required Secondary Function Required Secondary Function Required Secondary Function Lower Order Function Input Higher Order Function Output Concurrent Secondary Functions Concurrent Secondary Functions Concurrent Secondary Functions Functions that happen "At the same time and/or are caused by" some other function. Secondary Function Secondary Function Critical Path of Functions

Scope of Problem Under Study