THE TECHNIQUE OF DATA FLOW DIAGRAMMING.docx - THE TECHNIQUE OF DATA FLOW DIAGRAMMING This section describes in detail the data flow diagramming


This preview shows page 1 - 2 out of 5 pages.

THE TECHNIQUE OF DATA FLOW DIAGRAMMING This section describes in detail the data flow diagramming technique. It is intended to serve as a handbook to guide the reader in developing data flow diagramming skills. Definition: Data Flow Diagramming is a means of representing a system at any level of detail with a graphic network of symbols showing data flows, data stores, data processes, and data sources/destinations. Purpose/Objective: The purpose of data flow diagrams is to provide a semantic bridge between users and systems developers. The diagrams are: graphical, eliminating thousands of words; logical representations, modelling WHAT a system does, rather than physical models showing HOW it does it; hierarchical, showing systems at any level of detail; and Jargon less, allowing user understanding and reviewing. The goal of data flow diagramming is to have a commonly understood model of a system. The diagrams are the basis of structured systems analysis. Data flow diagrams are supported by other techniques of structured systems analysis such as data structure diagrams, data dictionaries, and procedure-representing techniques such as decision tables, decision trees, and structured English. Data flow diagrams have the objective of avoiding the cost of: User/developer misunderstanding of a system, resulting in a need to redo systems or in not using the system. Having to start documentation from scratch when the physical system changes since the logical system, WHAT gets done, often remains the same when technology changes. Systems inefficiencies because a system gets "computerized" before it gets "systematized". Being unable to evaluate system project boundaries or degree of automation, resulting in a project of inappropriate scope.
Image of page 1
Image of page 2

You've reached the end of your free preview.

Want to read all 5 pages?

  • Spring '14

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors