The correct answer is B . FAST stands for Function Analysis System Technique. SAVE defines a FAST diagram as a graphical representation of dependent relationships of functions within a project, product, or process. The diagram uses logical relationships such as “How,” “Why,” and “When” to organize functions. It is a core Function Analysis tool because it forces the team to examine why functions exist, how they are accomplished, and which functions lie on the critical function logic path.

Option A is incorrect because schedule networks belong to project scheduling, not function modeling. Option C is wrong because cost spreadsheets may support resource analysis, but they do not show functional dependency logic. Option D is a procurement management artifact. FAST is valuable because it shifts the team from objects and components to function relationships. This enables better creativity because the team can ask, “How else can we perform this function?” rather than merely asking, “How can we make this component cheaper?”

References/topics: FAST Diagram; Function Analysis System Technique; How-Why Logic.