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== Development of functional flow block diagrams ==
[[Image:Development of Functional Flow Block Diagrams.jpg|thumb|right|240px|Figure 2: Development of Functional Flow Block Diagrams<ref name="
FFBDs can be developed in a series of levels. FFBDs show the same tasks identified through functional decomposition and display them in their logical, sequential relationship. For example, the entire [[flight mission]] of a [[spacecraft]] can be defined in a top level FFBD, as shown in Figure 2. Each block in the first level diagram can then be expanded to a series of functions, as shown in the second level diagram for "perform mission operations." Note that the diagram shows both input (transfer to operational orbit) and output (transfer to space transportation system orbit), thus initiating the interface identification and control process. Each block in the second level diagram can be progressively developed into a series of functions, as shown in the third level diagram on Figure 2.<ref name="NASA95"/>
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