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The underlying objective of an information flow diagram is to show how information flows from a Source to a Receiver (e.g. A→ C), through some medium. The medium acts as a bridge, a means of transmitting the information (Word of mouth, radio, email...). The concept of IFD was initially used in radio transmission.〔http://www.business-online-learning.com/information-flow-diagram.html〕 The System also includes an element of feedback, a reply or response to the signal that was given out. The return paths can be 2-way, information can flow back and forth and it can also be bi-directional. Although it is most common that information will be passed on.〔 Information flow diagram (IFD) is used to illustrate the information flow throughout an organisation. An IFD shows the relationship between external and internal information flows between an organisation. It also shows the relationship between the internal departments and sub-systems. 〔https://books.google.co.uk/books?id=WIXP-3VhztgC&pg=PA122&lpg=PA122&dq=An+information+flow+diagram+(IFD)+is+an+illustration+of+information+flow+throughout+an+organisation.+An+IFD+shows+the+relationship+between+external+and+internal+information+flows+between+an+organisation.+It+also+shows+the+relationship+between+the+internal+departments+and+sub-systems.&source=bl&ots=g-miJAjwef&sig=vIpkgUvsjVYvy7FCzMekKKQTcMA&hl=en&sa=X&ved=0CCYQ6AEwAWoVChMIz_WGr4PtyAIVxrYaCh1HOAu0#v=onepage&q&f=false〕 An Information Flow Diagram is information about a system laid out in diagramatic form. An IFD usually uses "blobs" to decompose the system and sub-systems into elemental parts.〔 Lines then indicate how the information travels from one system to another. IFDs are used in businesses, government agencies, television and cinematic processes. Information Flow Diagrams are often confused with Data Flow Diagrams. Information Flow Diagrams show information as sources, destination and flows. Whereas Data flow Diagrams show processes where inputs are transformed into outputs, Databases are also present in Data Flow Diagrams to show where data is held within the systems. Further, in Data flow diagrams, information destinations are re-termed as ‘sinks’.〔http://www.stephenson.ac.uk/computing/it_hn03/16_information_systems/resources/im/ch10.pdf〕 ==Purpose== Peter Checkland, a British management scientist, described information flows between the different elements that compose various systems. He also defined a system as a 'community situated within an environment'. 〔 The main purpose of an Information Flow Diagram is so that sources that send and receive information can be displayed neatly and analysed. This allows viewers to see the forwarding of information and the analysis of different situations.〔 The creation of an Information Flow Diagram is, in most cases, the first step to Information Analysis. 〔https://books.google.co.uk/books?id=iJaqCAAAQBAJ&pg=PA37&lpg=PA37&dq=%22information+flow+diagram%22&source=bl&ots=CwXOhb0r97&sig=wWSsFA-62B06r3YZVJh9z6QA574&hl=en&sa=X&ved=0CFwQ6AEwDGoVChMIns-dnIvtyAIVAl0aCh0togoK#v=onepage&q=%22information%20flow%20diagram%22&f=false〕 Information Flow Diagrams are behaviour diagrams that show the exchange of data between systems. They are also used to describe the circulation of information within systems.〔 http://www.uml-diagrams.org/information-flow-diagrams.html 〕 Information Flow Diagrams clearly display how data moves within a system, user interaction points and authorisation boundaries.〔 https://security.ufl.edu/it-workers/risk-assessment/creating-an-information-systemdata-flow-diagram/ 〕 Information that moves along the diagram is represented as either information items or by concrete classifiers. Information Flow diagrams are used for the following cases:〔 * When determination is needed of the main flows within an organisation * When you want to map items to build a fact-finding process, accurate and efficient method of documenting findings. * Develop high level overview of the flow of information in an organisation. Highlight detailed flows in an individual task. * Describe the flow of information inside and around organisations〔https://books.google.co.uk/books?id=jSTmRXVaOjQC&pg=PT451&lpg=PT451&dq=%22information+flow+diagram%22&source=bl&ots=EziEbIZnRp&sig=3mvv9ng1fnNI7XOit0sECeSJoIs&hl=en&sa=X&ved=0CB8Q6AEwADgKahUKEwi5qdemkuDIAhWCLhoKHY_LAcc#v=onepage&q=%22information%20flow%20diagram%22&f=false〕 and between departments.〔https://books.google.co.uk/books?id=MDx5LMbkqCsC&pg=PT57&lpg=PT57&dq=%22information+flow+diagram%22&source=bl&ots=NXo221ug9x&sig=RnjO8RAjOhKI6cqf4fLFY61zD78&hl=en&sa=X&ved=0CC4Q6AEwAzgKahUKEwi5qdemkuDIAhWCLhoKHY_LAcc#v=onepage&q=%22information%20flow%20diagram%22&f=false〕 * Map the dependencies applications, their information objects, interfaces and the functional information flow between (sub-) applications.〔https://books.google.co.uk/books?id=PKSnTPkp94EC&pg=PA83&lpg=PA83&dq=%22information+flow+diagram%22&source=bl&ots=Th0Dwns86H&sig=8UJHZ-Zq8v3eBP_6NW2NFU-w-nQ&hl=en&sa=X&ved=0CCIQ6AEwATgUahUKEwilxfOxju3IAhXH5xoKHeuuCz4#v=onepage&q=%22information%20flow%20diagram%22&f=false〕 * Understand business process bottlenecks in sequential, deferred, real-time, parallel, wheel, one to-many,many-to-many and many-to-one-to-many information flows.〔http://foresight.ifmo.ru/ict/shared/files/201312/1_191.pdf〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Information flow diagram」の詳細全文を読む スポンサード リンク
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