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control flow diagram, Gantt chart, PERT diagram, and IDEF have emerged since the beginning of the 20th century. The Gantt charts were among the first to arrive around 1899, the flow charts in the 1920s, functional flow block diagram and PERT in the 1950s, and data-flow diagrams and IDEF in the 1970s. Among the modern methods are Unified Modeling Language

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