The Function Analysis System Technique (FAST) diagram is a key tool in Value Methodology’s Function Analysis phase, as taught in the VMF 1 course (Core Competency #2). FAST diagrams map the relationships between functions, with the horizontal axis showing the “how-why” logic (critical path) and vertical lines called scope lines defining the study’s boundaries. According to SAVE International’s Value Methodology Standard, “the left vertical line in a FAST diagram is a scope line, and the function immediately to its right is typically the higher-order function, which represents the overarching goal or need for the system.” The functionto the leftof the left scope line is outside the study’s scope and often represents an even broader objective or external assumption that drives the higher-order function. However, in standard FAST diagramming, thehigher-order functionis the closest function to the left scope line within the scope, and functions to the left of the scope line (e.g., P in the diagram from Question 30) are external.
In the context of the VMA exam and VMF 1, the question likely tests the understanding of the higher-order function’s position relative to the scope line. As established in Question 18, Function E (just inside the left scope line B) is the higher-order function. Functions to the left of the left scope line (e.g., P) are typically external assumptions or broader objectives, but the options provided (A, B, C, D) refer to standard function classifications within the FAST framework. Thehigher-order function(C) is the most relevant choice, as it is the function closest to the left scope line within the study’s scope, and the question may be interpreted as asking for the function type associated with that position.
Option A (Basic Function) is incorrect because the basic function is typically more central on the critical path, not at the far left.
Option B (Secondary Function) is incorrect because secondary functions are vertical (supporting the critical path), not on the main path near the left scope line.
Option C (Higher Order Function) is correct, as the higher-order function is located just to the right of the left scope line (e.g., Function E), and the question may be interpreted in this context based on standard FAST conventions.
Option D (Lower Order Function) is incorrect because lower-order functions are to the right of the basic function, representing more specific outcomes, not near the left scope line.
[:, SAVE International, VMF 1 Core Competency #2 (Function Analysis), defining the position of the higher-order function in FAST diagrams., SAVE International, “Value Methodology Standard,” section on Function Analysis, describing FAST diagramming conventions, including the role of scope lines and higher-order functions., ]
