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
Text Box: WHENText Box: Same Time
Text Box: Same Time
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
Scope of Problem Under Study