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Uml sequence diagram example inputs outputs11/18/2023 ![]() In the early 1930s, an industrial engineer, Allan H. Gilbreth's tools quickly found their way into industrial engineering curricula. The first structured method for documenting process flow, the flow process chart, was introduced by Frank Gilbreth to members of American Society of Mechanical Engineers (ASME) in 1921 as the presentation “Process Charts-First Steps in Finding the One Best Way”. ![]() įFBDs are also referred to as functional flow diagrams, functional block diagrams, and functional flows. FFBDs are one of the classic business process modeling methodologies, along with flow charts, data flow diagrams, control flow diagrams, Gantt charts, PERT diagrams, and IDEF. The FFBD notation was developed in the 1950s, and is widely used in classical systems engineering. FFBDs may also express input and output data dependencies between functional blocks, as shown in figures below, but FFBDs primarily focus on sequencing. ![]() Here, "functional flow" pertains to the sequencing of operations, with "flow" arrows expressing dependence on the success of prior operations. The term "functional" in this context is different from its use in functional programming or in mathematics, where pairing "functional" with "flow" would be ambiguous. Ī functional flow block diagram ( FFBD) is a multi-tier, time-sequenced, step-by-step flow diagram of a system's functional flow. Figure 1: Functional flow block diagram format.
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