flowchart

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      A flowchart is a type of diagram that represents a workflow or process. A flowchart can also be defined as a diagrammatic representation of an algorithm, a step-by-step approach to solving a task.
      The flowchart shows the steps as boxes of various kinds, and their order by connecting the boxes with arrows. This diagrammatic representation illustrates a solution model to a given problem. Flowcharts are used in analyzing, designing, documenting or managing a process or program in various fields.


      Overview



      Flowcharts are used to design and document simple processes or programs. Like other types of diagrams, they help visualize the process. Two of the many benefits are flaws and bottlenecks may become apparent. Flowcharts typically use the following main symbols:

      A process step, usually called an activity, is denoted by a rectangular box.
      A decision is usually denoted by a diamond.
      A flowchart is described as "cross-functional" when the chart is divided into different vertical or horizontal parts, to describe the control of different organizational units. A symbol appearing in a particular part is within the control of that organizational unit. A cross-functional flowchart allows the author to correctly locate the responsibility for performing an action or making a decision, and to show the responsibility of each organizational unit for different parts of a single process.
      Flowcharts represent certain aspects of processes and are usually complemented by other types of diagram. For instance, Kaoru Ishikawa defined the flowchart as one of the seven basic tools of quality control, next to the histogram, Pareto chart, check sheet, control chart, cause-and-effect diagram, and the scatter diagram. Similarly, in UML, a standard concept-modeling notation used in software development, the activity diagram, which is a type of flowchart, is just one of many different diagram types.
      Nassi-Shneiderman diagrams and Drakon-charts are an alternative notation for process flow.
      Common alternative names include: flow chart, process flowchart, functional flowchart, process map, process chart, functional process chart, business process model, process model, process flow diagram, work flow diagram, business flow diagram. The terms "flowchart" and "flow chart" are used interchangeably.
      The underlying graph structure of a flowchart is a flow graph, which abstracts away node types, their contents and other ancillary information.


      History


      The first structured method for documenting process flow, the "flow process chart", was introduced by Frank and Lillian Gilbreth in the presentation "Process Charts: First Steps in Finding the One Best Way to do Work", to members of the American Society of Mechanical Engineers (ASME) in 1921. The Gilbreths' tools quickly found their way into industrial engineering curricula. In the early 1930s, an industrial engineer, Allan H. Mogensen began to train business people in the use of some of the tools of industrial engineering at his Work Simplification Conferences in Lake Placid, New York.
      Art Spinanger, a 1944 graduate of Mogensen's class, took the tools back to Procter and Gamble where he developed their Deliberate Methods Change Program. Ben S. Graham, another 1944 graduate, Director of Formcraft Engineering at Standard Register Industrial, applied the flow process chart to information processing with his development of the multi-flow process chart, to present multiple documents and their relationships. In 1947, ASME adopted a symbol set derived from Gilbreth's original work as the "ASME Standard: Operation and Flow Process Charts."
      Douglas Hartree in 1949 explained that Herman Goldstine and John von Neumann had developed a flowchart (originally, diagram) to plan computer programs. His contemporary account was endorsed by IBM engineers and by Goldstine's personal recollections. The original programming flowcharts of Goldstine and von Neumann can be found in their unpublished report, "Planning and coding of problems for an electronic computing instrument, Part II, Volume 1" (1947), which is reproduced in von Neumann's collected works.
      The flowchart became a popular tool for describing computer algorithms, but its popularity decreased in the 1970s, when interactive computer terminals and third-generation programming languages became common tools for computer programming, since algorithms can be expressed more concisely as source code in such languages. Often pseudo-code is used, which uses the common idioms of such languages without strictly adhering to the details of a particular one. Also, flowcharts are not well-suited for new programming techniques such as recursive programming.
      Nevertheless, flowcharts were still used in the early 21st century for describing computer algorithms. Some techniques such as UML activity diagrams and Drakon-charts can be considered to be extensions of the flowchart.


      Types



      Sterneckert (2003) suggested that flowcharts can be modeled from the perspective of different user groups (such as managers, system analysts and clerks), and that there are four general types:

      Document flowcharts, showing controls over a document-flow through a system
      Data flowcharts, showing controls over a data-flow in a system
      System flowcharts, showing controls at a physical or resource level
      Program flowchart, showing the controls in a program within a system
      Notice that every type of flowchart focuses on some kind of control, rather than on the particular flow itself.
      However, there are some different classifications. For example, Andrew Veronis (1978) named three basic types of flowcharts: the system flowchart, the general flowchart, and the detailed flowchart. That same year Marilyn Bohl (1978) stated "in practice, two kinds of flowcharts are used in solution planning: system flowcharts and program flowcharts...". More recently, Mark A. Fryman (2001) identified more differences: "Decision flowcharts, logic flowcharts, systems flowcharts, product flowcharts, and process flowcharts are just a few of the different types of flowcharts that are used in business and government".
      In addition, many diagram techniques are similar to flowcharts but carry a different name, such as UML activity diagrams.
      Reversible flowcharts represent a paradigm in computing that focuses on the reversibility of computational processes. Unlike traditional computing models, where operations are often irreversible, reversible flowcharts ensure that any atomic computational step can be reversed. Reversible flowcharts are shown to be as expressive as reversible Turing machines, and are a theoretical foundation for structured reversible programming and energy-efficient reversible computing systems.


      Building blocks




      = Common symbols

      =
      The American National Standards Institute (ANSI) set standards for flowcharts and their symbols in the 1960s. The International Organization for Standardization (ISO) adopted the ANSI symbols in 1970. The current standard, ISO 5807, was published in 1985 and last reviewed in 2019. Generally, flowcharts flow from top to bottom and left to right.


      = Other symbols

      =
      The ANSI/ISO standards include symbols beyond the basic shapes. Some are:


      = Parallel processing

      =
      Parallel Mode is represented by two horizontal lines at the beginning or ending of simultaneous operations
      For parallel and concurrent processing the Parallel Mode horizontal lines or a horizontal bar indicate the start or end of a section of processes that can be done independently:

      At a fork, the process creates one or more additional processes, indicated by a bar with one incoming path and two or more outgoing paths.
      At a join, two or more processes continue as a single process, indicated by a bar with several incoming paths and one outgoing path. All processes must complete before the single process continues.


      Diagramming software



      Any drawing program can be used to create flowchart diagrams, but these will have no underlying data model to share data with databases or other programs such as project management systems or spreadsheet. Many software packages exist that can create flowcharts automatically, either directly from a programming language source code, or from a flowchart description language.
      There are several applications and visual programming languages that use flowcharts to represent and execute programs. Generally these are used as teaching tools for beginner students.


      See also




      References




      Further reading


      ISO 5807 (1985). Information processing – Documentation symbols and conventions for data, program and system flowcharts, program network charts and system resources charts. International Organization for Standardization.{{cite book}}: CS1 maint: numeric names: authors list (link)
      ISO 10628: Diagrams for the chemical and petrochemical industry
      ECMA 4: Flowcharts (withdrawn – list of withdrawn standards)
      Schultheiss, Louis A., and Edward M. Heiliger. "Techniques of flow-charting Archived 2021-07-14 at the Wayback Machine." (1963); with introduction by Edward Heiliger.


      External links



      Flowcharting Techniques: An IBM manual from 1969 (5 MB; PDF)

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